chantal rosmuller hvqzadwantennanl thank domain relay domain recommended choice use relay_recipient_maps yes relay domain use relay_recipient_maps need make mapping file example relay_recipient_maps mysqlconfig_directorymysql_recipient_mapscf question put file query 2 tables users aliases possible cant need use reject_unverified_recipient reject_unlisted_recipient make sure call check relay domains check expensive map lookup incurs smtp connection domain virtual mailbox domain users must listed virtual_mailbox_maps domain local domain mydestination users must listed local_recipien_maps virtual_alias_maps always consulted valid recipients dont need add recipient maps fri 08 aug 2008 031102 0100 refuse mail nonexisting addresses relay_recipient_maps reject_unlisted_recipient something else