smtp trying to send through port 0?

I'm running win 2000 server and have CONTS mail set-up on
asp pages on differing sites. My problem is that the
emails sent from CDONTS asp pages are not getting past the
server and no one is recieving them. The firewall isn't
blocking port 25 outbound, so I looked at the logs for the
SMTP service and I found that the SMTP server is trying to
use port 0 or rather no port at all. I have specified port
25 under both of the options under the General tab:
Advanced and Connection. Am I barking up the wrong tree or
is there a solution to this?

The log file is below:
date time c-ip cs-username s-sitename s-computername s-ip
s-port cs-method time-taken cs-host cs(Referer)
2004-06-11 10:06:26 217.45.118.221 mainserver.best-
lock.local SMTPSVC1 ACCESS 217.199.182.182 0 EHLO 125 - -
2004-06-11 10:06:26 217.45.118.221 mainserver.best-
lock.local SMTPSVC1 ACCESS 217.199.182.182 0 MAIL 0 - -
2004-06-11 10:06:26 217.45.118.221 mainserver.best-
lock.local SMTPSVC1 ACCESS 217.199.182.182 0 RCPT 0 - -
2004-06-11 10:06:26 217.45.118.221 mainserver.best-
lock.local SMTPSVC1 ACCESS 217.199.182.182 0 QUIT 0 - -

Any help would be appreciated

Thanks