Index: branches/ucs-4.1/ucs-4.1-1/mail/univention-mail-postfix/share/listfilter.py
===================================================================
--- branches/ucs-4.1/ucs-4.1-1/mail/univention-mail-postfix/share/listfilter.py	(Revision 68624)
+++ branches/ucs-4.1/ucs-4.1-1/mail/univention-mail-postfix/share/listfilter.py	(Arbeitskopie)
@@ -98,7 +98,10 @@
 
 					# get dn and groups of sender
 					if check_sasl_username:
-						ldap_filter = '(&(uid=%s)(objectclass=posixAccount))' % sender
+						if "@" in sender:
+							ldap_filter = '(&(mailPrimaryAddress=%s)(objectclass=posixAccount))' % sender
+						else:
+							ldap_filter = '(&(uid=%s)(objectclass=posixAccount))' % sender
 					else:
 						ldap_filter = '(&(|(mailPrimaryAddress=%s)(mailAlternativeAddress=%s)(mail=%s))(objectclass=posixAccount))' % (sender, sender, sender)
 					user_result = ldap.search(base=options.ldap_base, filter=ldap_filter, attr=["dn"])