diff --git a/jdav_web/mailer/migrations/0008_alter_emailaddress_name.py b/jdav_web/mailer/migrations/0008_alter_emailaddress_name.py
new file mode 100644
index 0000000..952bacd
--- /dev/null
+++ b/jdav_web/mailer/migrations/0008_alter_emailaddress_name.py
@@ -0,0 +1,19 @@
+# Generated by Django 4.0.1 on 2024-12-03 23:19
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mailer', '0007_emailaddress_internal_only'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='emailaddress',
+            name='name',
+            field=models.CharField(max_length=50, unique=True, validators=[django.core.validators.RegexValidator('^[0-9a-zA-Z._-]*$', 'Only alphanumeric characters, ., - and _ are allowed')], verbose_name='name'),
+        ),
+    ]
diff --git a/jdav_web/mailer/models.py b/jdav_web/mailer/models.py
index bed3877..685be2f 100644
--- a/jdav_web/mailer/models.py
+++ b/jdav_web/mailer/models.py
@@ -22,7 +22,8 @@ alphanumeric = RegexValidator(r'^[0-9a-zA-Z._-]*$',
 
 class EmailAddress(models.Model):
     """Represents an email address, that is forwarded to specific members"""
-    name = models.CharField(_('name'), max_length=50, validators=[alphanumeric])
+    name = models.CharField(_('name'), max_length=50, validators=[alphanumeric],
+                            unique=True)
     to_members = models.ManyToManyField('members.Member',
                                         verbose_name=_('Forward to participants'),
                                         blank=True)
@@ -63,6 +64,7 @@ class EmailAddressForm(forms.ModelForm):
         exclude = []
 
     def clean(self):
+        super(EmailAddressForm, self).clean()
         group = self.cleaned_data.get('to_groups')
         members = self.cleaned_data.get('to_members')
         if not group and not members: