I have a linux router having eth0 193.x.x.x a public IP, with eth1 192.168.0.2 to lan, ip masquerade is ok, all pc in the lan can access the internet, I have also configured the router to dnat to my mail server with a private ip of 192.168.0.3, mails go out to other domains, and mails come in from other domain only if sent though webinterface, but if other domains send mails using other clients like outlook,and outlook express the mails are not delivered to my mail server, can any one help