diff --git a/src/electron-main/database/entity/mail.ts b/src/electron-main/database/entity/mail.ts
index 16bec9223..704dd6415 100644
--- a/src/electron-main/database/entity/mail.ts
+++ b/src/electron-main/database/entity/mail.ts
@@ -52,7 +52,6 @@ export class Mail extends Entity implements Model.Mail {
     @IsInt()
     sentDate!: Model.Mail["sentDate"];
 
-    @IsNotEmpty()
     @IsString()
     subject!: Model.Mail["subject"];