diff --git a/modoboa/extensions/admin/__init__.py b/modoboa/extensions/admin/__init__.py
index 2a6d9e106..0c03630a8 100644
--- a/modoboa/extensions/admin/__init__.py
+++ b/modoboa/extensions/admin/__init__.py
@@ -196,6 +196,7 @@ def import_account_mailbox(user, account, row):
 @events.observe("AccountAutoCreated")
 def account_auto_created(user):
     from modoboa.core.models import User
+    from modoboa.extensions.admin.lib import check_if_domain_exists
     from modoboa.lib.permissions import grant_access_to_object
 
     if parameters.get_admin("LDAP_CREATE_DOMAIN_MAILBOX", app="core") == "no":
@@ -207,6 +208,9 @@ def account_auto_created(user):
     try:
         domain = Domain.objects.get(name=domname)
     except Domain.DoesNotExist:
+        label = check_if_domain_exists(domname)
+        if label is not None:
+            return
         domain = Domain(name=domname, enabled=True, quota=0)
         domain.save(creator=sadmins[0])
         for su in sadmins[1:]:
diff --git a/modoboa/extensions/admin/forms/domain.py b/modoboa/extensions/admin/forms/domain.py
index 99d955422..c38a95f2d 100644
--- a/modoboa/extensions/admin/forms/domain.py
+++ b/modoboa/extensions/admin/forms/domain.py
@@ -7,6 +7,7 @@ from modoboa.lib.formutils import (
     DomainNameField, YesNoField, DynamicForm, TabForms
 )
 from modoboa.core.models import User
+from modoboa.extensions.admin.lib import check_if_domain_exists
 from modoboa.extensions.admin.models import (
     Domain, DomainAlias, Mailbox, Alias, Quota
 )
@@ -71,18 +72,13 @@ class DomainFormGeneral(forms.ModelForm, DynamicForm):
 
         cleaned_data = self.cleaned_data
         name = cleaned_data["name"]
-        dtypes = events.raiseQueryEvent('CheckDomainName')
-        for dtype, label in [(DomainAlias, _('domain alias'))] + dtypes:
-            try:
-                dtype.objects.get(name=name)
-            except dtype.DoesNotExist:
-                pass
-            else:
-                self._errors["name"] = self.error_class(
-                    [_("A %s with this name already exists" % unicode(label))]
-                )
-                del cleaned_data["name"]
-                break
+        label = check_if_domain_exists(name)
+        if label is not None:
+            self._errors["name"] = self.error_class(
+                [_("A %s with this name already exists" % unicode(label))]
+            )
+            del cleaned_data["name"]
+
         for k in cleaned_data.keys():
             if not k.startswith("aliases"):
                 continue
diff --git a/modoboa/extensions/admin/lib.py b/modoboa/extensions/admin/lib.py
index d84a998d4..269ae48af 100644
--- a/modoboa/extensions/admin/lib.py
+++ b/modoboa/extensions/admin/lib.py
@@ -10,7 +10,7 @@ from modoboa.lib import parameters, events
 from modoboa.lib.exceptions import PermDeniedException
 from modoboa.lib.emailutils import split_mailbox
 from modoboa.extensions.admin.models import (
-    Domain, Alias
+    Domain, DomainAlias, Alias
 )
 
 
@@ -137,3 +137,21 @@ def get_domains(user, domfilter=None, searchquery=None, **extrafilters):
         'ExtraDomainEntries', user, domfilter, searchquery, **extrafilters
     )
     return chain(domains, extra_domain_entries)
+
+
+def check_if_domain_exists(name):
+    """Check if a domain already exists.
+
+    We not only look for domains, we also look for every object that
+    could conflict with a domain (domain alias, etc.)
+
+    """
+    dtypes = events.raiseQueryEvent('CheckDomainName')
+    for dtype, label in [(DomainAlias, _('domain alias'))] + dtypes:
+        try:
+            dtype.objects.get(name=name)
+        except dtype.DoesNotExist:
+            pass
+        else:
+            return label
+    return None