diff --git a/mailadmin/permissions.py b/mailadmin/permissions.py
index ea4c6d1..d3337fc 100644
--- a/mailadmin/permissions.py
+++ b/mailadmin/permissions.py
@@ -50,6 +50,6 @@ class DestinationPrefixOwner(permissions.BasePermission):
         if len(my_prefixes) == 0:
             return False
         # Prepare regular expression
-        regexp = '|'.join(['{0}-'.format(p) for p in my_prefixes])
+        regexp = '|'.join(['^{0}-'.format(p) for p in my_prefixes])
         # The destination should have at least one match with the prefix regexp
         return re.search(regexp, fw.data['dest']) is not None
\ No newline at end of file
diff --git a/mailadmin/views.py b/mailadmin/views.py
index 5246e31..fe6bdb5 100644
--- a/mailadmin/views.py
+++ b/mailadmin/views.py
@@ -67,8 +67,7 @@ class ForwardsViewSet(viewsets.ViewSet):
 
         my_prefixes = orgunits.values_list('prefix', flat=True)
         # Prepare regular expression
-        regexp = '|'.join(['{0}-'.format(p) for p in my_prefixes])
-
+        regexp = '|'.join(['^{0}-'.format(p) for p in my_prefixes])
         if len(my_prefixes) == 0:
             return Response({'result': 'No results'})  # Need at least one