I'm still relatively new to Postfix, but I did have it working once. Here's the setup:

Small business network in a 10.0.0.0/8 range + 1 (one) home user on SBC DSL Previously this user was on a cable modem. I bring up the cable modem because my current configuration USED TO WORK PERFECTLY!!

When he moved, he changed his service provider. Simple enough, right? I just changed his old IP to his new IP (edited my firewall, /etc/postfix/main.cf, /etc/postfix/access, and ran postmap access) and restarted postfix.

He can still pull his email off the POP3 server, but any SMTP attempts just time out. I have double-checked everything I can think of.

The relevant pieces are below:
/etc/postfix/access
66.138.98.x RELAY

/etc/postfix/main.cf
My mynetworks = 10.0.0.0/8, 127.0.0.0/8, 66.138.98.x/32

Once again, this USED to work! I am at a loss. ANY help is appreciated. Please advise if there is any other configuration information I should supply. I'd offer mail logs, but except for the POP3 logins, I don't see anything show up.

If the user is attempting to relay, whether successfully or not, the logs would show it. Since they don't, perhaps he did not configure his SMTP server correctly on his mail client.

I configured the client software myself (MS Outlook), so I'm pretty certain it's correct. And again, it *was* working before. I did consider that maybe certain software updates might have messed things up, so I double-checked the client side again, but it looks correct to me. There's nothing unusual going on - no SPA, no odd ports, no authentication other than POP.

It is possible I missed seeing his entries in the log. It's a somewhat busy server even for a small business, so there are a lot of entries, but I did my best at grepping for what I thought should be there. And again, the firewall is definitely open (but just for kicks I set all the policies to ACCEPT - no change).

Thanks for the suggestion, but I don't think that's it.

I checked the logs again and grepped for the IP. There's definitely nothing in there except POP logins.

I would expect a firewall problem then, but I've pretty well ruled that out. I'm willing to try tweaking the Outlook settings (again) if anybody wants to suggest specific actions.

Anybody??

Have you been successful in telnetting from the user's machine to port 25 of the mail server?