diff --git a/packages/backend/src/services/create-notification.ts b/packages/backend/src/services/create-notification.ts
index f6545b131c..e2dd3fc332 100644
--- a/packages/backend/src/services/create-notification.ts
+++ b/packages/backend/src/services/create-notification.ts
@@ -6,11 +6,13 @@ import {
 	NoteThreadMutings,
 	UserProfiles,
 	Users,
+	Followings,
 } from "@/models/index.js";
 import { genId } from "@/misc/gen-id.js";
 import type { User } from "@/models/entities/user.js";
 import type { Notification } from "@/models/entities/notification.js";
 import { sendEmailNotification } from "./send-email-notification.js";
+import { shouldSilenceInstance } from "@/misc/should-block-instance.js";
 
 export async function createNotification(
 	notifieeId: User["id"],
@@ -21,6 +23,26 @@ export async function createNotification(
 		return null;
 	}
 
+	if (
+		data.notifierId &&
+		["mention", "reply", "renote", "quote", "reaction"].includes(type)
+	) {
+		const notifier = await Users.findOneBy({ id: data.notifierId });
+		// suppress if the notifier does not exist or is silenced.
+		if (!notifier) return null;
+
+		// suppress if the notifier is silenced or in a silenced instance, and not followed by the notifiee.
+		if (
+			(notifier.isSilenced ||
+				(Users.isRemoteUser(notifier) &&
+					(await shouldSilenceInstance(notifier.host)))) &&
+			!(await Followings.exist({
+				where: { followerId: notifieeId, followeeId: data.notifierId },
+			}))
+		)
+			return null;
+	}
+
 	const profile = await UserProfiles.findOneBy({ userId: notifieeId });
 
 	const isMuted = profile?.mutingNotificationTypes.includes(type);
diff --git a/packages/backend/src/services/following/requests/create.ts b/packages/backend/src/services/following/requests/create.ts
index 27f9144d0e..50dbd9b3be 100644
--- a/packages/backend/src/services/following/requests/create.ts
+++ b/packages/backend/src/services/following/requests/create.ts
@@ -80,7 +80,13 @@ export default async function (
 	}
 
 	if (Users.isLocalUser(follower) && Users.isRemoteUser(followee)) {
-		const content = renderActivity(renderFollow(follower, followee, requestId ?? `${config.url}/follows/${followRequest.id}`));
+		const content = renderActivity(
+			renderFollow(
+				follower,
+				followee,
+				requestId ?? `${config.url}/follows/${followRequest.id}`,
+			),
+		);
 		deliver(follower, content, followee.inbox);
 	}
 }
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index ad50bd97a4..f1164c9c6e 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -205,11 +205,12 @@ export default async (
 			data.visibility = "home";
 		}
 
-		const inSilencedInstance =
-			Users.isRemoteUser(user) && (await shouldSilenceInstance(user.host));
-
 		// Enforce home visibility if the user is in a silenced instance.
-		if (data.visibility === "public" && inSilencedInstance) {
+		if (
+			data.visibility === "public" &&
+			Users.isRemoteUser(user) &&
+			(await shouldSilenceInstance(user.host))
+		) {
 			data.visibility = "home";
 		}
 
@@ -317,16 +318,6 @@ export default async (
 			}
 		}
 
-		// Remove from mention the local users who aren't following the remote user in the silenced instance.
-		if (inSilencedInstance) {
-			const relations = await Followings.findBy([
-				{ followeeId: user.id, followerHost: IsNull() }, // a local user following the silenced user
-			]).then((rels) => rels.map((rel) => rel.followerId));
-			mentionedUsers = mentionedUsers.filter((mentioned) =>
-				relations.includes(mentioned.id),
-			);
-		}
-
 		const note = await insertNote(user, data, tags, emojis, mentionedUsers);
 
 		res(note);
diff --git a/packages/backend/src/services/note/reaction/create.ts b/packages/backend/src/services/note/reaction/create.ts
index 20a724f3da..277393eb41 100644
--- a/packages/backend/src/services/note/reaction/create.ts
+++ b/packages/backend/src/services/note/reaction/create.ts
@@ -12,7 +12,6 @@ import {
 	Notes,
 	Emojis,
 	Blockings,
-	Followings,
 } from "@/models/index.js";
 import { IsNull, Not } from "typeorm";
 import { perUserReactionsChart } from "@/services/chart/index.js";
@@ -22,7 +21,6 @@ import deleteReaction from "./delete.js";
 import { isDuplicateKeyValueError } from "@/misc/is-duplicate-key-value-error.js";
 import type { NoteReaction } from "@/models/entities/note-reaction.js";
 import { IdentifiableError } from "@/misc/identifiable-error.js";
-import { shouldSilenceInstance } from "@/misc/should-block-instance.js";
 
 export default async (
 	user: { id: User["id"]; host: User["host"] },
@@ -121,24 +119,7 @@ export default async (
 	});
 
 	// Create notification if the reaction target is a local user.
-	if (
-		note.userHost === null &&
-		// if a local user reacted, or
-		(Users.isLocalUser(user) ||
-			// if a remote user not in a silenced instance reacted
-			(Users.isRemoteUser(user) &&
-			// if a remote user is in a silenced instance and the target is a local follower.
-				!(
-					(await shouldSilenceInstance(user.host)) &&
-					!(await Followings.exist({
-						where: {
-							followerId: note.userId,
-							followerHost: IsNull(),
-							followeeId: user.id,
-						},
-					}))
-				)))
-	) {
+	if (note.userHost === null) {
 		createNotification(note.userId, "reaction", {
 			notifierId: user.id,
 			note: note,