feat(email): Bypass API 계정 이메일 알림 및 거절 후속 조치 (#140)

- 이메일 공통 모듈 (spring-boot-starter-mail, EmailService, Thymeleaf 템플릿)
- 승인 시 계정 발급 이메일 / 거절 시 사유 이메일 자동 발송
- 재심사 기능 (REJECTED → PENDING)
- UI 텍스트 리레이블링 (S&P Global API)
- 신청 폼 전화번호 필드 제거 및 레이아웃 개선

frontend/src/api/bypassAccountApi.ts

@@ -135,4 +135,6 @@ export const bypassAccountApi = {
         postJson<ApiResponse<BypassAccountResponse>>(`${BASE}/requests/${id}/approve`, data),
     rejectRequest: (id: number, data: BypassRequestReviewRequest) =>
         postJson<ApiResponse<BypassRequestResponse>>(`${BASE}/requests/${id}/reject`, data),
+    reopenRequest: (id: number) =>
+        postJson<ApiResponse<BypassRequestResponse>>(`${BASE}/requests/${id}/reopen`, {}),
 };

frontend/src/components/Navbar.tsx

@@ -38,11 +38,11 @@ const MENU_STRUCTURE: MenuSection[] = [
     },
     {
         id: 'bypass',
-        label: 'S&P Bypass',
+        label: 'S&P Global API',
-        shortLabel: 'Bypass',
+        shortLabel: 'S&P Global API',
         icon: (
             <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 9l4-4 4 4m0 6l-4 4-4-4" />
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9" />
             </svg>
         ),
         defaultPath: '/bypass-catalog',
@@ -51,7 +51,7 @@ const MENU_STRUCTURE: MenuSection[] = [
             { id: 'bypass-config', label: 'API 관리', path: '/bypass-config' },
             { id: 'bypass-account-requests', label: '계정 신청 관리', path: '/bypass-account-requests' },
             { id: 'bypass-account-management', label: '계정 관리', path: '/bypass-account-management' },
-            { id: 'bypass-access-request', label: 'API 접근 신청', path: '/bypass-access-request' },
+            { id: 'bypass-access-request', label: 'API 계정 신청', path: '/bypass-access-request' },
         ],
     },
     {

frontend/src/pages/BypassAccessRequest.tsx

@@ -11,21 +11,18 @@ interface FormState {
     organization: string;
     purpose: string;
     email: string;
-    phone: string;
     requestedAccessPeriod: string;
 }
 
 interface ErrorState {
     applicantName?: string;
     email?: string;
-    phone?: string;
     requestedAccessPeriod?: string;
 }
 
 interface TouchedState {
     applicantName: boolean;
     email: boolean;
-    phone: boolean;
     requestedAccessPeriod: boolean;
 }
 
@@ -36,26 +33,16 @@ const INITIAL_FORM: FormState = {
     organization: '',
     purpose: '',
     email: '',
-    phone: '',
     requestedAccessPeriod: '',
 };
 
 const INITIAL_TOUCHED: TouchedState = {
     applicantName: false,
     email: false,
-    phone: false,
     requestedAccessPeriod: false,
 };
 
 const EMAIL_REGEX = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
-const PHONE_DIGITS_REGEX = /^\d{11}$/;
-
-function formatPhoneDisplay(digits: string): string {
-    const d = digits.slice(0, 11);
-    if (d.length <= 3) return d;
-    if (d.length <= 7) return `${d.slice(0, 3)}-${d.slice(3)}`;
-    return `${d.slice(0, 3)}-${d.slice(3, 7)}-${d.slice(7)}`;
-}
 
 function toDateString(date: Date): string {
     const y = date.getFullYear();
@@ -89,7 +76,7 @@ function calcPresetPeriod(preset: PeriodPreset): string {
     return `${from} ~ ${to}`;
 }
 
-function validateForm(form: FormState, phoneRaw: string): ErrorState {
+function validateForm(form: FormState): ErrorState {
     const errors: ErrorState = {};
 
     if (!form.applicantName.trim()) {
@@ -102,12 +89,8 @@ function validateForm(form: FormState, phoneRaw: string): ErrorState {
         errors.email = '올바른 이메일 형식을 입력해주세요.';
     }
 
-    if (phoneRaw && !PHONE_DIGITS_REGEX.test(phoneRaw)) {
-        errors.phone = '전화번호는 11자리 숫자로 입력해주세요. (예: 01012345678)';
-    }
-
     if (!form.requestedAccessPeriod.trim()) {
-        errors.requestedAccessPeriod = '요청 접근 기간을 선택해주세요.';
+        errors.requestedAccessPeriod = '사용 기간을 선택해주세요.';
     }
 
     return errors;
@@ -118,8 +101,6 @@ export default function BypassAccessRequest() {
     const navigate = useNavigate();
 
     const [form, setForm] = useState<FormState>(INITIAL_FORM);
-    const [phoneRaw, setPhoneRaw] = useState('');
-    const [phoneDisplay, setPhoneDisplay] = useState('');
     const [submitting, setSubmitting] = useState(false);
     const [submittedId, setSubmittedId] = useState<number | null>(null);
 
@@ -139,16 +120,9 @@ export default function BypassAccessRequest() {
         setForm((prev) => ({ ...prev, [field]: value }));
     };
 
-    const handlePhoneChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-        const digits = e.target.value.replace(/\D/g, '').slice(0, 11);
-        setPhoneRaw(digits);
-        setPhoneDisplay(formatPhoneDisplay(digits));
-        setForm((prev) => ({ ...prev, phone: digits }));
-    };
-
     const handleBlur = (field: keyof TouchedState) => {
         setTouched((prev) => ({ ...prev, [field]: true }));
-        const currentErrors = validateForm(form, phoneRaw);
+        const currentErrors = validateForm(form);
         setErrors(currentErrors);
     };
 
@@ -204,9 +178,9 @@ export default function BypassAccessRequest() {
     const handleSubmit = async (e: React.FormEvent) => {
         e.preventDefault();
         setSubmitAttempted(true);
-        setTouched({ applicantName: true, email: true, phone: true, requestedAccessPeriod: true });
+        setTouched({ applicantName: true, email: true, requestedAccessPeriod: true });
 
-        const currentErrors = validateForm(form, phoneRaw);
+        const currentErrors = validateForm(form);
 
         if (periodManual && periodRangeError) {
             return;
@@ -228,7 +202,7 @@ export default function BypassAccessRequest() {
                 organization: form.organization,
                 purpose: form.purpose,
                 email: form.email,
-                phone: form.phone,
+                phone: '',
                 requestedAccessPeriod: form.requestedAccessPeriod,
             };
             const res = await bypassAccountApi.submitRequest(requestData);
@@ -258,9 +232,9 @@ export default function BypassAccessRequest() {
         <div className="space-y-6">
             {/* 헤더 */}
             <div>
-                <h1 className="text-2xl font-bold text-wing-text">Bypass API 접근 신청</h1>
+                <h1 className="text-2xl font-bold text-wing-text">S&P API 계정 신청</h1>
                 <p className="mt-1 text-sm text-wing-muted">
-                    Bypass API 사용 계정을 신청합니다. 검토 후 계정 정보가 이메일로 발송됩니다.
+                    S&P API 계정을 신청합니다. 검토 후 계정 정보가 이메일로 발송됩니다.
                 </p>
             </div>
 
@@ -283,8 +257,6 @@ export default function BypassAccessRequest() {
                         type="button"
                         onClick={() => {
                             setForm(INITIAL_FORM);
-                            setPhoneRaw('');
-                            setPhoneDisplay('');
                             setErrors({});
                             setTouched(INITIAL_TOUCHED);
                             setSubmitAttempted(false);
@@ -304,7 +276,7 @@ export default function BypassAccessRequest() {
                         onClick={() => navigate('/bypass-catalog')}
                         className="mt-3 px-6 py-2 text-sm font-medium text-wing-text bg-wing-card hover:bg-wing-hover border border-wing-border rounded-lg transition-colors"
                     >
-                        Bypass API 목록 보기
+                        S&P API 목록 보기
                     </button>
                 </div>
             ) : (
@@ -346,7 +318,7 @@ export default function BypassAccessRequest() {
                                 </div>
                             </div>
 
-                            {/* 이메일 + 전화번호 */}
+                            {/* 이메일 + 사용 기간 */}
                             <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                                 <div id="field-email">
                                     <label className="block text-sm font-medium text-wing-text mb-1">
@@ -365,21 +337,82 @@ export default function BypassAccessRequest() {
                                         <p className="mt-1 text-xs text-red-500">{errors.email}</p>
                                     )}
                                 </div>
-                                <div id="field-phone">
+                                <div id="field-requestedAccessPeriod">
-                                    <label className="block text-sm font-medium text-wing-text mb-1">
+                                    <div className="flex items-center justify-between mb-1">
-                                        전화번호
+                                        <label className="text-sm font-medium text-wing-text">
-                                    </label>
+                                            사용 기간 <span className="text-red-500">*</span>
-                                    <input
+                                        </label>
-                                        type="text"
+                                        <button
-                                        value={phoneDisplay}
+                                            type="button"
-                                        onChange={handlePhoneChange}
+                                            onClick={handleToggleManual}
-                                        onBlur={() => handleBlur('phone')}
+                                            className="flex items-center gap-2 text-xs text-wing-muted hover:text-wing-text transition-colors"
-                                        placeholder="010-0000-0000"
+                                        >
-                                        disabled={submitting}
+                                            <span>직접 선택</span>
-                                        className={inputClass('phone')}
+                                            <span
-                                    />
+                                                className={`relative inline-flex h-4 w-8 items-center rounded-full transition-colors ${
-                                    {showError('phone') && (
+                                                    periodManual ? 'bg-wing-accent' : 'bg-wing-border'
-                                        <p className="mt-1 text-xs text-red-500">{errors.phone}</p>
+                                                }`}
+                                            >
+                                                <span
+                                                    className={`inline-block h-3 w-3 rounded-full bg-white shadow transition-transform ${
+                                                        periodManual ? 'translate-x-4' : 'translate-x-0.5'
+                                                    }`}
+                                                />
+                                            </span>
+                                        </button>
+                                    </div>
+                                    {!periodManual ? (
+                                        <div className="flex flex-wrap gap-2">
+                                            {PRESETS.map((preset) => (
+                                                <button
+                                                    key={preset}
+                                                    type="button"
+                                                    onClick={() => handlePresetClick(preset)}
+                                                    disabled={submitting}
+                                                    className={`px-4 py-1.5 text-sm rounded-full border transition-colors disabled:opacity-50 disabled:cursor-not-allowed ${
+                                                        selectedPreset === preset
+                                                            ? 'bg-wing-accent text-white border-wing-accent'
+                                                            : 'bg-wing-card text-wing-text border-wing-border hover:border-wing-accent hover:text-wing-accent'
+                                                    }`}
+                                                >
+                                                    {preset}
+                                                </button>
+                                            ))}
+                                        </div>
+                                    ) : (
+                                        <div className="flex items-center gap-3">
+                                            <div className="flex-1">
+                                                <input
+                                                    type="date"
+                                                    value={periodFrom}
+                                                    onChange={(e) => handlePeriodFromChange(e.target.value)}
+                                                    disabled={submitting}
+                                                    className="w-full px-3 py-2 text-sm rounded-lg border border-wing-border bg-wing-card text-wing-text focus:outline-none focus:ring-2 focus:ring-wing-accent/50"
+                                                />
+                                            </div>
+                                            <span className="text-sm text-wing-muted flex-shrink-0">~</span>
+                                            <div className="flex-1">
+                                                <input
+                                                    type="date"
+                                                    value={periodTo}
+                                                    onChange={(e) => handlePeriodToChange(e.target.value)}
+                                                    disabled={submitting}
+                                                    className="w-full px-3 py-2 text-sm rounded-lg border border-wing-border bg-wing-card text-wing-text focus:outline-none focus:ring-2 focus:ring-wing-accent/50"
+                                                />
+                                            </div>
+                                        </div>
+                                    )}
+
+                                    {form.requestedAccessPeriod && !periodRangeError && (
+                                        <p className="mt-2 text-xs text-wing-muted">
+                                            선택된 기간: <span className="font-medium text-wing-text">{form.requestedAccessPeriod}</span>
+                                        </p>
+                                    )}
+                                    {periodRangeError && (
+                                        <p className="mt-1 text-xs text-red-500">{periodRangeError}</p>
+                                    )}
+                                    {showError('requestedAccessPeriod') && !periodRangeError && (
+                                        <p className="mt-1 text-xs text-red-500">{errors.requestedAccessPeriod}</p>
                                     )}
                                 </div>
                             </div>
@@ -399,89 +432,6 @@ export default function BypassAccessRequest() {
                                 />
                             </div>
 
-                            {/* 요청 접근 기간 */}
-                            <div id="field-requestedAccessPeriod">
-                                <label className="block text-sm font-medium text-wing-text mb-1">
-                                    요청 접근 기간 <span className="text-red-500">*</span>
-                                </label>
-                                <div className="flex items-center gap-2 mb-2">
-                                    <button
-                                        type="button"
-                                        onClick={handleToggleManual}
-                                        className="flex items-center gap-2 text-xs text-wing-muted hover:text-wing-text transition-colors"
-                                    >
-                                        <span>직접 선택</span>
-                                        <span
-                                            className={`relative inline-flex h-4 w-8 items-center rounded-full transition-colors ${
-                                                periodManual ? 'bg-wing-accent' : 'bg-wing-border'
-                                            }`}
-                                        >
-                                            <span
-                                                className={`inline-block h-3 w-3 rounded-full bg-white shadow transition-transform ${
-                                                    periodManual ? 'translate-x-4' : 'translate-x-0.5'
-                                                }`}
-                                            />
-                                        </span>
-                                    </button>
-                                </div>
-
-                                {!periodManual ? (
-                                    /* Preset buttons */
-                                    <div className="flex flex-wrap gap-2">
-                                        {PRESETS.map((preset) => (
-                                            <button
-                                                key={preset}
-                                                type="button"
-                                                onClick={() => handlePresetClick(preset)}
-                                                disabled={submitting}
-                                                className={`px-4 py-1.5 text-sm rounded-full border transition-colors disabled:opacity-50 disabled:cursor-not-allowed ${
-                                                    selectedPreset === preset
-                                                        ? 'bg-wing-accent text-white border-wing-accent'
-                                                        : 'bg-wing-card text-wing-text border-wing-border hover:border-wing-accent hover:text-wing-accent'
-                                                }`}
-                                            >
-                                                {preset}
-                                            </button>
-                                        ))}
-                                    </div>
-                                ) : (
-                                    /* Manual date range inputs */
-                                    <div className="flex items-center gap-3">
-                                        <div className="flex-1">
-                                            <input
-                                                type="date"
-                                                value={periodFrom}
-                                                onChange={(e) => handlePeriodFromChange(e.target.value)}
-                                                disabled={submitting}
-                                                className="w-full px-3 py-2 text-sm rounded-lg border border-wing-border bg-wing-card text-wing-text focus:outline-none focus:ring-2 focus:ring-wing-accent/50"
-                                            />
-                                        </div>
-                                        <span className="text-sm text-wing-muted flex-shrink-0">~</span>
-                                        <div className="flex-1">
-                                            <input
-                                                type="date"
-                                                value={periodTo}
-                                                onChange={(e) => handlePeriodToChange(e.target.value)}
-                                                disabled={submitting}
-                                                className="w-full px-3 py-2 text-sm rounded-lg border border-wing-border bg-wing-card text-wing-text focus:outline-none focus:ring-2 focus:ring-wing-accent/50"
-                                            />
-                                        </div>
-                                    </div>
-                                )}
-
-                                {/* Period preview */}
-                                {form.requestedAccessPeriod && !periodRangeError && (
-                                    <p className="mt-2 text-xs text-wing-muted">
-                                        선택된 기간: <span className="font-medium text-wing-text">{form.requestedAccessPeriod}</span>
-                                    </p>
-                                )}
-                                {periodRangeError && (
-                                    <p className="mt-1 text-xs text-red-500">{periodRangeError}</p>
-                                )}
-                                {showError('requestedAccessPeriod') && !periodRangeError && (
-                                    <p className="mt-1 text-xs text-red-500">{errors.requestedAccessPeriod}</p>
-                                )}
-                            </div>
                         </div>
 
                         <div className="mt-6 flex justify-end">

frontend/src/pages/BypassAccountManagement.tsx

@@ -337,10 +337,6 @@ export default function BypassAccountManagement() {
                                     <span className="text-wing-muted">이메일: </span>
                                     <span className="text-wing-text">{editTarget.email ?? '-'}</span>
                                 </div>
-                                <div>
-                                    <span className="text-wing-muted">전화번호: </span>
-                                    <span className="text-wing-text">{editTarget.phone ?? '-'}</span>
-                                </div>
                             </div>
                         </div>
 

frontend/src/pages/BypassAccountRequests.tsx

@@ -293,14 +293,10 @@ export default function BypassAccountRequests() {
                                     <span className="text-wing-muted">이메일: </span>
                                     <span className="text-wing-text">{approveTarget.email ?? '-'}</span>
                                 </div>
-                                <div>
+                            </div>
-                                    <span className="text-wing-muted">전화번호: </span>
+                            <div className="mt-2 text-xs">
-                                    <span className="text-wing-text">{approveTarget.phone ?? '-'}</span>
+                                <span className="text-wing-muted">요청 기간: </span>
-                                </div>
+                                <span className="text-wing-text">{approveTarget.requestedAccessPeriod ?? '-'}</span>
-                                <div className="col-span-2">
-                                    <span className="text-wing-muted">요청 기간: </span>
-                                    <span className="text-wing-text">{approveTarget.requestedAccessPeriod ?? '-'}</span>
-                                </div>
                             </div>
                             {approveTarget.purpose && (
                                 <div className="mt-2 pt-2 border-t border-wing-border text-xs">
@@ -396,14 +392,10 @@ export default function BypassAccountRequests() {
                                     <span className="text-wing-muted">이메일: </span>
                                     <span className="text-wing-text">{rejectTarget.email ?? '-'}</span>
                                 </div>
-                                <div>
+                            </div>
-                                    <span className="text-wing-muted">전화번호: </span>
+                            <div className="mt-2 text-xs">
-                                    <span className="text-wing-text">{rejectTarget.phone ?? '-'}</span>
+                                <span className="text-wing-muted">요청 기간: </span>
-                                </div>
+                                <span className="text-wing-text">{rejectTarget.requestedAccessPeriod ?? '-'}</span>
-                                <div className="col-span-2">
-                                    <span className="text-wing-muted">요청 기간: </span>
-                                    <span className="text-wing-text">{rejectTarget.requestedAccessPeriod ?? '-'}</span>
-                                </div>
                             </div>
                             {rejectTarget.purpose && (
                                 <div className="mt-2 pt-2 border-t border-wing-border text-xs">
@@ -485,10 +477,6 @@ export default function BypassAccountRequests() {
                                     <div className="text-xs text-wing-muted mb-0.5">이메일</div>
                                     <div className="text-wing-text">{detailTarget.email ?? '-'}</div>
                                 </div>
-                                <div>
-                                    <div className="text-xs text-wing-muted mb-0.5">전화번호</div>
-                                    <div className="text-wing-text">{detailTarget.phone ?? '-'}</div>
-                                </div>
                             </div>
                             <div>
                                 <div className="text-xs text-wing-muted mb-0.5">요청 접근 기간</div>
@@ -549,6 +537,25 @@ export default function BypassAccountRequests() {
                                     </button>
                                 </>
                             )}
+                            {detailTarget.status === 'REJECTED' && (
+                                <button
+                                    type="button"
+                                    onClick={async () => {
+                                        try {
+                                            await bypassAccountApi.reopenRequest(detailTarget.id);
+                                            setDetailTarget(null);
+                                            showToast('재심사 상태로 변경되었습니다.', 'success');
+                                            await loadRequests();
+                                        } catch (err) {
+                                            showToast('재심사 처리 실패', 'error');
+                                            console.error(err);
+                                        }
+                                    }}
+                                    className="px-4 py-2 text-sm font-medium text-white bg-amber-500 hover:bg-amber-600 rounded-lg transition-colors"
+                                >
+                                    재심사
+                                </button>
+                            )}
                         </div>
                     </div>
                 </div>

frontend/src/pages/BypassCatalog.tsx

@@ -92,9 +92,9 @@ export default function BypassCatalog() {
             {/* 헤더 */}
             <div className="flex items-center justify-between">
                 <div>
-                    <h1 className="text-2xl font-bold text-wing-text">Bypass API 카탈로그</h1>
+                    <h1 className="text-2xl font-bold text-wing-text">S&P Global API 카탈로그</h1>
                     <p className="mt-1 text-sm text-wing-muted">
-                        등록된 Bypass API 목록입니다. Swagger UI에서 직접 테스트할 수 있습니다.
+                        S&P Global Maritime API 목록입니다. Swagger UI에서 직접 테스트할 수 있습니다.
                     </p>
                 </div>
                 <a

frontend/src/pages/MainMenu.tsx

@@ -12,13 +12,13 @@ const sections = [
         menuCount: 6,
     },
     {
-        title: 'S&P Bypass',
+        title: 'S&P Global API',
-        description: 'S&P Bypass API 관리',
+        description: 'S&P Global Maritime API',
-        detail: 'API 등록, 코드 생성 관리, 테스트',
+        detail: 'API 카탈로그, API 계정 신청',
         path: '/bypass-catalog',
-        icon: '🔗',
+        icon: '🌐',
         iconClass: 'gc-card-icon gc-card-icon-guide',
-        menuCount: 1,
+        menuCount: 5,
     },
     {
         title: 'S&P Risk & Compliance',

pom.xml

@@ -45,6 +45,12 @@
             <artifactId>spring-boot-starter-security</artifactId>
         </dependency>
 
+        <!-- Spring Boot Starter Mail -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-mail</artifactId>
+        </dependency>
+
         <!-- Spring Boot Starter Batch -->
         <dependency>
             <groupId>org.springframework.boot</groupId>

src/main/java/com/snp/batch/global/controller/BypassAccountController.java

@@ -114,4 +114,10 @@ public class BypassAccountController {
             @RequestBody BypassRequestReviewRequest review) {
         return ResponseEntity.ok(ApiResponse.success(requestService.rejectRequest(id, review)));
     }
+
+    @PostMapping("/requests/{id}/reopen")
+    @Operation(summary = "신청 재심사 (거절 → 대기)")
+    public ResponseEntity<ApiResponse<BypassRequestResponse>> reopenRequest(@PathVariable Long id) {
+        return ResponseEntity.ok(ApiResponse.success(requestService.reopenRequest(id)));
+    }
 }

src/main/java/com/snp/batch/service/BypassApiRequestService.java

@@ -26,6 +26,7 @@ public class BypassApiRequestService {
     private final BypassApiRequestRepository requestRepository;
     private final BypassApiAccountRepository accountRepository;
     private final BypassApiAccountService accountService;
+    private final EmailService emailService;
 
     @Transactional
     public BypassRequestResponse submitRequest(BypassRequestSubmitRequest request) {
@@ -82,6 +83,18 @@ public class BypassApiRequestService {
         request.setAccount(accountRepository.getReferenceById(accountResponse.getId()));
         requestRepository.save(request);
 
+        // 이메일 발송 (비동기)
+        if (request.getEmail() != null && !request.getEmail().isBlank()) {
+            emailService.sendAccountApprovedEmail(
+                    request.getEmail(),
+                    request.getApplicantName(),
+                    accountResponse.getUsername(),
+                    accountResponse.getPlainPassword(),
+                    review.getAccessStartDate() != null ? review.getAccessStartDate().toString() : null,
+                    review.getAccessEndDate() != null ? review.getAccessEndDate().toString() : null
+            );
+        }
+
         log.info("Bypass API 계정 신청 승인: requestId={}, accountUsername={}",
                 id, accountResponse.getUsername());
         return accountResponse;
@@ -100,10 +113,36 @@ public class BypassApiRequestService {
         request.setRejectReason(review.getRejectReason());
         BypassApiRequest saved = requestRepository.save(request);
 
+        // 이메일 발송 (비동기)
+        if (request.getEmail() != null && !request.getEmail().isBlank()) {
+            emailService.sendRequestRejectedEmail(
+                    request.getEmail(),
+                    request.getApplicantName(),
+                    review.getRejectReason()
+            );
+        }
+
         log.info("Bypass API 계정 신청 거절: requestId={}", id);
         return toResponse(saved);
     }
 
+    @Transactional
+    public BypassRequestResponse reopenRequest(Long id) {
+        BypassApiRequest request = findOrThrow(id);
+        if (request.getStatus() != RequestStatus.REJECTED) {
+            throw new IllegalStateException("거절된 신청만 재심사할 수 있습니다: " + request.getStatus());
+        }
+
+        request.setStatus(RequestStatus.PENDING);
+        request.setReviewedBy(null);
+        request.setReviewedAt(null);
+        request.setRejectReason(null);
+        BypassApiRequest saved = requestRepository.save(request);
+
+        log.info("Bypass API 계정 신청 재심사: requestId={}", id);
+        return toResponse(saved);
+    }
+
     private BypassApiRequest findOrThrow(Long id) {
         return requestRepository.findById(id)
                 .orElseThrow(() -> new IllegalArgumentException("신청을 찾을 수 없습니다: " + id));

src/main/java/com/snp/batch/service/EmailService.java

@@ -0,0 +1,84 @@
+package com.snp.batch.service;
+
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.MimeMessage;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Service;
+import org.thymeleaf.TemplateEngine;
+import org.thymeleaf.context.Context;
+
+/**
+ * 이메일 발송 공통 서비스
+ *
+ * 비동기(@Async)로 발송하여 API 응답 지연을 방지한다.
+ * Thymeleaf 템플릿 엔진으로 HTML 이메일을 구성한다.
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class EmailService {
+
+    private final JavaMailSender mailSender;
+    private final TemplateEngine templateEngine;
+
+    @Value("${spring.mail.username:noreply@example.com}")
+    private String fromAddress;
+
+    @Value("${app.base-url:https://guide.gc-si.dev/snp-api}")
+    private String baseUrl;
+
+    /**
+     * Bypass API 계정 발급 이메일 발송
+     */
+    @Async
+    public void sendAccountApprovedEmail(String toEmail, String applicantName,
+                                          String username, String plainPassword,
+                                          String accessStartDate, String accessEndDate) {
+        Context context = new Context();
+        context.setVariable("applicantName", applicantName);
+        context.setVariable("username", username);
+        context.setVariable("password", plainPassword);
+        context.setVariable("accessStartDate", accessStartDate != null ? accessStartDate : "-");
+        context.setVariable("accessEndDate", accessEndDate != null ? accessEndDate : "-");
+        context.setVariable("swaggerUrl", baseUrl + "/swagger-ui/index.html?urls.primaryName=3.%20Bypass%20API");
+
+        String html = templateEngine.process("email/account-approved", context);
+        sendHtmlEmail(toEmail, "[S&P Data Platform] S&P API 계정이 발급되었습니다", html);
+    }
+
+    /**
+     * Bypass API 계정 신청 거절 이메일 발송
+     */
+    @Async
+    public void sendRequestRejectedEmail(String toEmail, String applicantName,
+                                          String rejectReason) {
+        Context context = new Context();
+        context.setVariable("applicantName", applicantName);
+        context.setVariable("rejectReason", rejectReason != null && !rejectReason.isBlank()
+                ? rejectReason : "별도 안내 없음");
+        context.setVariable("requestUrl", baseUrl + "/bypass-access-request");
+
+        String html = templateEngine.process("email/request-rejected", context);
+        sendHtmlEmail(toEmail, "[S&P Data Platform] S&P API 계정 신청이 거절되었습니다", html);
+    }
+
+    private void sendHtmlEmail(String to, String subject, String htmlContent) {
+        try {
+            MimeMessage message = mailSender.createMimeMessage();
+            MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8");
+            helper.setFrom(fromAddress);
+            helper.setTo(to);
+            helper.setSubject(subject);
+            helper.setText(htmlContent, true);
+            mailSender.send(message);
+            log.info("이메일 발송 완료: to={}, subject={}", to, subject);
+        } catch (MessagingException e) {
+            log.error("이메일 발송 실패: to={}, subject={}", to, subject, e);
+        }
+    }
+}

src/main/resources/application.yml

@@ -38,6 +38,17 @@ spring:
     prefix: classpath:/templates/
     suffix: .html
 
+  # Email (SMTP)
+  mail:
+    host: smtp.gmail.com
+    port: 587
+    username: hjkim4@gcsc.co.kr
+    password: khow urga yyxh rciq
+    properties:
+      mail.smtp.auth: true
+      mail.smtp.starttls.enable: true
+      mail.smtp.starttls.required: true
+
   # Quartz Scheduler Configuration - Using JDBC Store for persistence
   quartz:
     job-store-type: jdbc  # JDBC store for schedule persistence

src/main/resources/templates/email/account-approved.html

@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8"/>
+</head>
+<body style="margin:0; padding:0; background-color:#f4f4f5; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
+    <div style="max-width:560px; margin:40px auto; background:#ffffff; border-radius:12px; overflow:hidden; box-shadow:0 1px 3px rgba(0,0,0,0.1);">
+        <!-- Header -->
+        <div style="background:#0f172a; padding:24px 32px;">
+            <h1 style="color:#ffffff; font-size:18px; margin:0;">S&amp;P Data Platform</h1>
+        </div>
+
+        <!-- Body -->
+        <div style="padding:32px;">
+            <p style="font-size:15px; color:#1e293b; margin:0 0 16px;">
+                안녕하세요, <strong th:text="${applicantName}">신청자</strong>님.
+            </p>
+            <p style="font-size:14px; color:#475569; margin:0 0 24px; line-height:1.6;">
+                S&amp;P API 계정 발급 신청이 승인되었습니다.<br/>
+                아래 계정 정보로 API를 사용하실 수 있습니다.
+            </p>
+
+            <!-- Credentials box -->
+            <div style="background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:20px; margin-bottom:24px;">
+                <table style="width:100%; font-size:14px; color:#1e293b;">
+                    <tr>
+                        <td style="padding:6px 0; color:#64748b; width:100px;">사용자명</td>
+                        <td style="padding:6px 0; font-family:monospace; font-weight:bold;" th:text="${username}">bypass_xxxxxxxx</td>
+                    </tr>
+                    <tr>
+                        <td style="padding:6px 0; color:#64748b;">비밀번호</td>
+                        <td style="padding:6px 0; font-family:monospace; font-weight:bold;" th:text="${password}">xxxxxxxx</td>
+                    </tr>
+                    <tr>
+                        <td style="padding:6px 0; color:#64748b;">유효 기간</td>
+                        <td style="padding:6px 0;" th:text="${accessStartDate} + ' ~ ' + ${accessEndDate}">2026-01-01 ~ 2026-12-31</td>
+                    </tr>
+                </table>
+            </div>
+
+            <!-- Warning -->
+            <div style="background:#fef3c7; border:1px solid #fcd34d; border-radius:8px; padding:12px 16px; margin-bottom:24px;">
+                <p style="font-size:12px; color:#92400e; margin:0; line-height:1.5;">
+                    이 비밀번호는 이메일로 1회만 안내됩니다. 안전한 곳에 보관해주세요.<br/>
+                    비밀번호 분실 시 관리자에게 재설정을 요청하세요.
+                </p>
+            </div>
+
+            <p style="font-size:13px; color:#475569; margin:0; line-height:1.5;">
+                <a th:href="${swaggerUrl}" style="color:#2563eb; text-decoration:none; font-weight:500;">Swagger UI</a>에서
+                [Authorize] 버튼을 클릭하여 위 계정으로 인증 후 사용할 수 있습니다.
+            </p>
+        </div>
+
+        <!-- Footer -->
+        <div style="background:#f8fafc; padding:16px 32px; border-top:1px solid #e2e8f0;">
+            <p style="font-size:11px; color:#94a3b8; margin:0;">
+                본 메일은 S&amp;P Data Platform에서 자동 발송되었습니다.
+            </p>
+        </div>
+    </div>
+</body>
+</html>

src/main/resources/templates/email/request-rejected.html

@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8"/>
+</head>
+<body style="margin:0; padding:0; background-color:#f4f4f5; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
+    <div style="max-width:560px; margin:40px auto; background:#ffffff; border-radius:12px; overflow:hidden; box-shadow:0 1px 3px rgba(0,0,0,0.1);">
+        <!-- Header -->
+        <div style="background:#0f172a; padding:24px 32px;">
+            <h1 style="color:#ffffff; font-size:18px; margin:0;">S&amp;P Data Platform</h1>
+        </div>
+
+        <!-- Body -->
+        <div style="padding:32px;">
+            <p style="font-size:15px; color:#1e293b; margin:0 0 16px;">
+                안녕하세요, <strong th:text="${applicantName}">신청자</strong>님.
+            </p>
+            <p style="font-size:14px; color:#475569; margin:0 0 24px; line-height:1.6;">
+                S&amp;P API 계정 신청이 거절되었습니다.
+            </p>
+
+            <!-- Reason box -->
+            <div style="background:#fef2f2; border:1px solid #fecaca; border-radius:8px; padding:16px; margin-bottom:24px;">
+                <p style="font-size:12px; color:#991b1b; margin:0 0 4px; font-weight:bold;">거절 사유</p>
+                <p style="font-size:14px; color:#1e293b; margin:0; line-height:1.6; white-space:pre-wrap;" th:text="${rejectReason}">거절 사유 내용</p>
+            </div>
+
+            <p style="font-size:13px; color:#475569; margin:0; line-height:1.5;">
+                추가 문의 사항이 있으시면 관리자에게 연락해주세요.<br/>
+                신청서를 수정하여 다시 제출하실 수 있습니다.
+            </p>
+
+            <!-- 신청 바로가기 -->
+            <div style="text-align:center; margin-top:24px;">
+                <a th:href="${requestUrl}"
+                   style="display:inline-block; padding:10px 24px; background:#0f172a; color:#ffffff; font-size:13px; font-weight:600; text-decoration:none; border-radius:8px;">
+                    API 계정 신청 바로가기
+                </a>
+            </div>
+        </div>
+
+        <!-- Footer -->
+        <div style="background:#f8fafc; padding:16px 32px; border-top:1px solid #e2e8f0;">
+            <p style="font-size:11px; color:#94a3b8; margin:0;">
+                본 메일은 S&amp;P Data Platform에서 자동 발송되었습니다.
+            </p>
+        </div>
+    </div>
+</body>
+</html>