hi as above no external mail being delivered. i'm running exchange 2003 on a home network and had problems the other day with my dns. that has since been sorted but now mail has stopped being delivered. outbound is of course fine, and the address it sends out from is correct (alias@xxxxxxxxxxxxxx). background: home domin is called amsw.cobblerz.net but i changed the default domain policy so mail addresses are @cobblerz.co.uk. this was fine, but after testing i noticed the address it was coming from was username@xxxxxxxxxxxxxx instead of the alias i gave it. I have since unticked the "automatically update recipent addresses based on policy" box on the users email addresses page and it seems to be ok, but still no external mail. I am on a dynamic IP but have update system in place with my hot, dyndns.org so that shouldn't be causing a problem. have checked on their system and IP has updated ! i am sitting behind a dlink dsl604+ router and have port 25 forwarding to my exchange server. as i said, this was fine but now not.. any help much appreciated, it's driving me mad.. thanks guys