diff --git a/packages/backend/package.json b/packages/backend/package.json
index 79a57fa353..eccba10ed1 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -32,6 +32,7 @@
 		"@sinonjs/fake-timers": "9.1.2",
 		"@syuilo/aiscript": "0.11.1",
 		"@types/pg": "8.6.5",
+		"@types/unzipper": "0.10.5",
 		"ajv": "8.11.0",
 		"archiver": "5.3.1",
 		"autobind-decorator": "2.4.0",
diff --git a/packages/backend/src/core/EmailService.ts b/packages/backend/src/core/EmailService.ts
index 4c5cf7dfc4..019b9087cd 100644
--- a/packages/backend/src/core/EmailService.ts
+++ b/packages/backend/src/core/EmailService.ts
@@ -159,7 +159,7 @@ export class EmailService {
 			validateTypo: false, // TLDを見ているみたいだけどclubとか弾かれるので
 			validateDisposable: true, // 捨てアドかどうかチェック
 			validateSMTP: false, // 日本だと25ポートが殆どのプロバイダーで塞がれていてタイムアウトになるので
-		}) : { valid: true };
+		}) : { valid: true, reason: null };
 	
 		const available = exist === 0 && validated.valid;
 	
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/list.ts b/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
index 8624229db8..271b142126 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
@@ -41,8 +41,8 @@ export const meta = {
 					optional: false, nullable: true,
 				},
 				host: {
-					type: 'null',
-					optional: false,
+					type: 'string',
+					optional: false, nullable: true,
 					description: 'The local host is represented with `null`. The field exists for compatibility with other API endpoints that return files.',
 				},
 				url: {
diff --git a/packages/backend/yarn.lock b/packages/backend/yarn.lock
index 34127e1ad8..f2ea0b0a58 100644
--- a/packages/backend/yarn.lock
+++ b/packages/backend/yarn.lock
@@ -1762,6 +1762,13 @@
   resolved "https://registry.yarnpkg.com/@types/tough-cookie/-/tough-cookie-4.0.0.tgz#fef1904e4668b6e5ecee60c52cc6a078ffa6697d"
   integrity sha512-I99sngh224D0M7XgW1s120zxCt3VYQ3IQsuw3P3jbq5GG4yc79+ZjyKznyOGIQrflfylLgcfekeZW/vk0yng6A==
 
+"@types/unzipper@0.10.5":
+  version "0.10.5"
+  resolved "https://registry.yarnpkg.com/@types/unzipper/-/unzipper-0.10.5.tgz#36a963cf025162b4ac31642590cb4192971d633b"
+  integrity sha512-NrLJb29AdnBARpg9S/4ktfPEisbJ0AvaaAr3j7Q1tg8AgcEUsq2HqbNzvgLRoWyRtjzeLEv7vuL39u1mrNIyNA==
+  dependencies:
+    "@types/node" "*"
+
 "@types/uuid@8.3.4":
   version "8.3.4"
   resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-8.3.4.tgz#bd86a43617df0594787d38b735f55c805becf1bc"