diff --git a/CHANGELOG.md b/CHANGELOG.md
index 027f05c922..63f5c913f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 
 ### Server
 - Fix: nodeinfoにenableMcaptchaとenableTurnstileが無いのを修正
+- Fix: 禁止キーワードを含むノートがDelayed Queueに追加されて再処理される問題を修正
 
 ## 2024.2.0
 
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 9cec614d5c..2a5fd2e1a6 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -59,6 +59,7 @@ import { UtilityService } from '@/core/UtilityService.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
 import { isReply } from '@/misc/is-reply.js';
 import { trackPromise } from '@/misc/promise-tracker.js';
+import { IdentifiableError } from '@/misc/identifiable-error.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -151,8 +152,6 @@ type Option = {
 export class NoteCreateService implements OnApplicationShutdown {
 	#shutdownController = new AbortController();
 
-	public static ContainsProhibitedWordsError = class extends Error {};
-
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
@@ -264,7 +263,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 
 		if (this.utilityService.isKeyWordIncluded(data.cw ?? data.text ?? '', meta.prohibitedWords)) {
-			throw new NoteCreateService.ContainsProhibitedWordsError();
+			throw new IdentifiableError('689ee33f-f97c-479a-ac49-1b9f8140af99', 'Note contains prohibited words');
 		}
 
 		const inSilencedInstance = this.utilityService.isSilencedHost(meta.silencedHosts, user.host);
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index 7adadd799b..0a713149e5 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -24,6 +24,7 @@ import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 import { LdSignatureService } from '@/core/activitypub/LdSignatureService.js';
 import { ApInboxService } from '@/core/activitypub/ApInboxService.js';
 import { bindThis } from '@/decorators.js';
+import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type { InboxJobData } from '../types.js';
 
@@ -180,7 +181,14 @@ export class InboxProcessorService {
 		});
 
 		// アクティビティを処理
-		await this.apInboxService.performActivity(authUser.user, activity);
+		try {
+			await this.apInboxService.performActivity(authUser.user, activity);
+		} catch (e) {
+			if (e instanceof IdentifiableError) {
+				if (e.id === '689ee33f-f97c-479a-ac49-1b9f8140af99') return 'blocked notes with prohibited words';
+			}
+			throw e;
+		}
 		return 'ok';
 	}
 }
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index e6e4fcc745..2fa0bd099f 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -19,6 +19,7 @@ import { DI } from '@/di-symbols.js';
 import { isPureRenote } from '@/misc/is-pure-renote.js';
 import { MetaService } from '@/core/MetaService.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { ApiError } from '../../error.js';
 
 export const meta = {
@@ -376,8 +377,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				};
 			} catch (e) {
 				// TODO: 他のErrorもここでキャッチしてエラーメッセージを当てるようにしたい
-				if (e instanceof NoteCreateService.ContainsProhibitedWordsError) {
-					throw new ApiError(meta.errors.containsProhibitedWords);
+				if (e instanceof IdentifiableError) {
+					if (e.id === '689ee33f-f97c-479a-ac49-1b9f8140af99') throw new ApiError(meta.errors.containsProhibitedWords);
 				}
 
 				throw e;