diff --git a/modoboa/admin/migrations/0019_auto_20210130_2226.py b/modoboa/admin/migrations/0019_auto_20210130_2226.py
new file mode 100644
index 000000000..7f3c902e7
--- /dev/null
+++ b/modoboa/admin/migrations/0019_auto_20210130_2226.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.17 on 2021-01-30 22:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('admin', '0018_update_disabled_accounts_aliases'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='domain',
+            name='name',
+            field=models.CharField(help_text='The domain name', max_length=253, unique=True, verbose_name='name'),
+        ),
+    ]
diff --git a/modoboa/admin/models/domain.py b/modoboa/admin/models/domain.py
index b7db53700..282f9f887 100644
--- a/modoboa/admin/models/domain.py
+++ b/modoboa/admin/models/domain.py
@@ -23,7 +23,7 @@ from . import mixins
 class Domain(mixins.MessageLimitMixin, AdminObject):
     """Mail domain."""
 
-    name = models.CharField(ugettext_lazy("name"), max_length=100, unique=True,
+    name = models.CharField(ugettext_lazy("name"), max_length=253, unique=True,
                             help_text=ugettext_lazy("The domain name"))
     quota = models.PositiveIntegerField(
         default=0,