Okey it works now........ The fault was in question 3. the mail server pointed at another router/firewall. and the mail server reported the "external" ip# in response to a smtp helo command. nice :-) but as I understan it shound't well well. Thanks for now Antony. Regards Gunnar Okay, three more questions: 1. Is a mail server running on 192.168.0.100 (!) ? Can you telnet to it on the real 192.168.0.100 address from a local client? 2. Are there any access controls on the mail server, restricting the IPs from which it will accept connections? 3. Does the default route of the mail server point back to the firewall? Regards, Antony -- Software development can be quick, high quality, or low cost. The customer gets to pick any two out of three. Please reply to the list; please don't CC me.