diff --git a/packages/backend/src/core/entities/NotificationEntityService.ts b/packages/backend/src/core/entities/NotificationEntityService.ts
index f6409914eb62..cbe93fc0c02b 100644
--- a/packages/backend/src/core/entities/NotificationEntityService.ts
+++ b/packages/backend/src/core/entities/NotificationEntityService.ts
@@ -119,8 +119,6 @@ export class NotificationEntityService implements OnModuleInit {
 
 		let validNotifications = notifications;
 
-		validNotifications = await this.#filterValidNotifier(validNotifications, meId);
-
 		const noteIds = validNotifications.map(x => 'noteId' in x ? x.noteId : null).filter(isNotNull);
 		const notes = noteIds.length > 0 ? await this.notesRepository.find({
 			where: { id: In(noteIds) },
@@ -255,8 +253,6 @@ export class NotificationEntityService implements OnModuleInit {
 
 		let validNotifications = notifications;
 
-		validNotifications = await this.#filterValidNotifier(validNotifications, meId);
-
 		const noteIds = validNotifications.map(x => 'noteId' in x ? x.noteId : null).filter(isNotNull);
 		const notes = noteIds.length > 0 ? await this.notesRepository.find({
 			where: { id: In(noteIds) },
@@ -322,35 +318,4 @@ export class NotificationEntityService implements OnModuleInit {
 
 		return true;
 	}
-
-	/**
-	 * notifierが存在するか、ミュートされていないか、サスペンドされていないかを複数確認する
-	 */
-	async #filterValidNotifier <T extends MiNotification | MiGroupedNotification> (
-		notifications: T[],
-		meId: MiUser['id'],
-	) : Promise<T[]> {
-		const [
-			userIdsWhoMeMuting,
-			userMutedInstances,
-		] = await Promise.all([
-			this.cacheService.userMutingsCache.fetch(meId),
-			this.cacheService.userProfileCache.fetch(meId).then(p => new Set(p.mutedInstances)),
-		]);
-
-		const filteredNotifications = ((await Promise.all(notifications.map(async (notification) => {
-			if (!('notifierId' in notification)) return notification;
-			if (userIdsWhoMeMuting.has(notification.notifierId)) return null;
-
-			const notifier = await this.usersRepository.findOneBy({ id: notification.notifierId });
-			if (notifier === null) return null;
-			if (notifier.host && userMutedInstances.has(notifier.host)) return null;
-
-			if (notifier.isSuspended) return null;
-
-			return notification;
-		}))) as [T|null] ).filter((notification): notification is T => notification !== null);
-
-		return filteredNotifications;
-	}
 }