diff --git a/src/app/components/login/login.component.html b/src/app/components/login/login.component.html
index 44c38ee..341a2ca 100644
--- a/src/app/components/login/login.component.html
+++ b/src/app/components/login/login.component.html
@@ -37,6 +37,9 @@
           <p>{{ "login.errorMail0" | translate }}</p>
           } @if (loginSerivce.errorCode == 'auth/invalid-email') {
           <p>{{ "login.errorMail1" | translate }}</p>
+          } @if (mail.valid && mail.touched &&
+          !checkIfUserEmailIsValid(loginData.mail.toLowerCase())) {
+          <p>{{ "login.errorMail2" | translate }}</p>
           }
         </div>
         <input
diff --git a/src/assets/i18n/de.json b/src/assets/i18n/de.json
index def2665..60652ae 100644
--- a/src/assets/i18n/de.json
+++ b/src/assets/i18n/de.json
@@ -8,6 +8,7 @@
     "guest": "Gastzugang",
     "errorMail0": "Sie müssen eine E-Mail Adresse eingeben!",
     "errorMail1": "Diese E-Mail Adresse existiert nicht!",
+    "errorMail2": "Dies ist kein gültiges E-Mail-Format!",
     "errorPassword0": "Sie müssen ein Passwort eingeben!",
     "errorPassword1": "Das Passwort stimmt nicht mit der E-Mail Adresse überein!",
     "loginDialog0": "Einloggen",
diff --git a/src/assets/i18n/en.json b/src/assets/i18n/en.json
index ddddbb4..ced757a 100644
--- a/src/assets/i18n/en.json
+++ b/src/assets/i18n/en.json
@@ -8,6 +8,7 @@
     "guest": "Guest Log in",
     "errorMail0": "You must enter a mail!",
     "errorMail1": "This email address does not exist!",
+    "errorMail2": "This is not a valid email format!",
     "errorPassword0": "You must enter a password!",
     "errorPassword1": "The password does not match the email address!",
     "loginDialog0": "Logging in",