diff --git a/alfa-client/libs/admin/settings/src/lib/postfach/postfach-container/postfach-form/postfach.formservice.spec.ts b/alfa-client/libs/admin/settings/src/lib/postfach/postfach-container/postfach-form/postfach.formservice.spec.ts
index c188eb39cda6ad7cad6653ee45b4724b52c6201d..bbc93c26a6744ea5ae695e9c4400bdeccfdb1f72 100644
--- a/alfa-client/libs/admin/settings/src/lib/postfach/postfach-container/postfach-form/postfach.formservice.spec.ts
+++ b/alfa-client/libs/admin/settings/src/lib/postfach/postfach-container/postfach-form/postfach.formservice.spec.ts
@@ -9,10 +9,11 @@ import { PostfachFormService } from './postfach.formservice';
 
 describe('PostfachFormService', () => {
   let formService: PostfachFormService;
-  const postfachService: Mock<PostfachService> = mock(PostfachService);
+  let postfachService: Mock<PostfachService>;
   const formBuilder: FormBuilder = new FormBuilder();
 
   beforeEach(() => {
+    postfachService = mock(PostfachService);
     formService = new PostfachFormService(formBuilder, useFromMock(postfachService));
   });
 
diff --git a/alfa-client/libs/admin/settings/src/lib/postfach/postfach.service.ts b/alfa-client/libs/admin/settings/src/lib/postfach/postfach.service.ts
index 8003b1637a1e77b577c2cdf254a89dab16ce45a0..2fc6ec706f41b554a0a9812034f45cb596edf9f8 100644
--- a/alfa-client/libs/admin/settings/src/lib/postfach/postfach.service.ts
+++ b/alfa-client/libs/admin/settings/src/lib/postfach/postfach.service.ts
@@ -19,15 +19,19 @@ export class PostfachService {
 
   public save(postfach: Postfach): Observable<StateResource<PostfachResource>> {
     return this.postfachResourceService.save(this.buildPostfachSettingItem(postfach)).pipe(
-      tap((stateResource: StateResource<PostfachResource>) => {
-        if (!stateResource.loading) {
-          this.snackbarService.showInfo('Die Signatur wird erfolgreich gespeichert.');
-        }
-      }),
+      tap((stateResource: StateResource<PostfachResource>) =>
+        this.showInfoAfterSave(stateResource),
+      ),
       startWith(createEmptyStateResource<PostfachResource>(true)),
     );
   }
 
+  private showInfoAfterSave(stateResource: StateResource<PostfachResource>) {
+    if (!stateResource.loading) {
+      this.snackbarService.showInfo('Die Signatur wird erfolgreich gespeichert.');
+    }
+  }
+
   private buildPostfachSettingItem(postfach: Postfach): PostfachSettingsItem {
     return {
       name: SettingName.POSTFACH,