Hi everybody :) How to write this clearest *sigh* When i telnet to port 25 from my desktop machine to my secondary mail server (sendmail), the time period is almost instant, however when i telnet from my primary mail server outside my firewall to my primary mail server (exim) there is a noticeable delay. Anyone got any suggestions, have checked out my firewall script and it is letting though DNS stuff, also both servers have rev lookups. SOS Kind regards Craig