diff --git a/packages/backend/src/core/DeleteAccountService.ts b/packages/backend/src/core/DeleteAccountService.ts
index 48f27d558e..7d64c6f2ad 100644
--- a/packages/backend/src/core/DeleteAccountService.ts
+++ b/packages/backend/src/core/DeleteAccountService.ts
@@ -63,8 +63,6 @@ export class DeleteAccountService {
 			// 知り得る全SharedInboxにDelete配信
 			const content = this.apRendererService.addContext(this.apRendererService.renderDelete(this.userEntityService.genLocalUserUri(user.id), user));
 
-			const queue: string[] = [];
-
 			const followings = await this.followingsRepository.find({
 				where: [
 					{ followerSharedInbox: Not(IsNull()) },
@@ -73,15 +71,10 @@ export class DeleteAccountService {
 				select: ['followerSharedInbox', 'followeeSharedInbox'],
 			});
 
-			const inboxes = followings.map(x => x.followerSharedInbox ?? x.followeeSharedInbox);
+			const inboxes = followings.map(x => [x.followerSharedInbox ?? x.followeeSharedInbox as string, true] as const);
+			const queue = new Map<string, true>(inboxes);
 
-			for (const inbox of inboxes) {
-				if (inbox != null && !queue.includes(inbox)) queue.push(inbox);
-			}
-
-			for (const inbox of queue) {
-				this.queueService.deliver(user, content, inbox, true);
-			}
+			await this.queueService.deliverMany(user, content, queue);
 
 			this.queueService.createDeleteAccountJob(user, {
 				soft: false,