Are you allowing DNS? Are you clients able to make DNS requests from behind the firewall? Thanks, ____________________________________________ George Vieira Systems Manager georgev@xxxxxxxxxxxxxxxxxxxxxx Citadel Computer Systems Pty Ltd http://www.citadelcomputer.com.au -----Original Message----- From: Ian McBeth [mailto:imcbeth@xxxxxxxxx] Sent: Monday, August 04, 2003 6:44 AM To: 'Daniel Chemko' Cc: netfilter@xxxxxxxxxxxxxxxxxxx Subject: RE: forwarding based on hostname Hey I am not using the domain name to connect to the mail server that is hidden behind the Nat firewall box as I can not connect to it with the domain name but I can connect to it via the IP address. What am I doing wrong? Thanks