diff --git a/data/templates/slapd/mailserver.schema b/data/templates/slapd/mailserver.schema
index 432dd1934..7370ff6ce 100644
--- a/data/templates/slapd/mailserver.schema
+++ b/data/templates/slapd/mailserver.schema
@@ -82,7 +82,9 @@ objectclass ( 1.3.6.1.4.1.40328.1.1.2.2
 
 # Mail Group Objectclass
 objectclass ( 1.3.6.1.4.1.40328.1.1.2.3
-        NAME 'mailGroup' SUP top AUXILIARY
+        NAME 'mailGroup'
+        SUP top
+        AUXILIARY
         DESC 'Mail Group'
         MUST ( mail )
         )
@@ -92,4 +94,7 @@ objectclass ( 1.3.6.1.4.1.40328.1.2.4.4
         NAME 'mailAlias'
         SUP top
         STRUCTURAL
+        MUST (
+            mail $ maildrop
+            )
         )