Hey folks, it's been awhile since I've been here but I remember there were a lot of extremely intelligent participants last time, and I see a lot of their names still hanging around, so I thought maybe I would shoot a question your way.

It's not related to PHP directly, but I'm not a member of very many forums anymore, given that most of my time is taken up with work. Hopefully somebody might be able to shed some light anyways.

I'm running a dedicated server on Ubuntu which is at the moment multi tasking between running web services, database, and mail. My POP3 is working wonderfully, but I can't for the life of me figure out what's going wrong with my SMTP. I've scoured the documentation and many many tutorials, but I can't seem to connect.

I have Postfix set up with libsasl for authentication. Everything is configured, and when I telnet to localhost 25 from my shell I get what appears to be an acceptable response;


Connected to localhost.
Escape character is '^]'.
220 mail.k....s.com ESMTP Postfix (Ubuntu)
ehlo localhost
250-mail.k....s.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN


I have DNS A records for the mail subdomain, and MX records set accordingly. However, while I can telnet from localhost, I can't reach telnet on port 25 from my local machine. This led me to check my firewall, but my iptables is set to allow connections on port 25;


-[~] iptables -L | grep smtp
ACCEPT tcp -- anywhere anywhere tcp dpt:smtp


So the denial must be happening somewhere in postfix' main.cf, or somewhere else I can't track down. Anybody here got any ideas?

This may be stupid but have you checked any firewalls or AV software?

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Not stupid at all, but no my local firewall isn't blocking the connection, and neither is my server firewall (as posted above, iptables). I have a feeling the problem lies in the postfix configuration itself, but I even tried opening mynetworks to the world, the easiest way to get blacklisted, and even that didn't work... I'm banging my head against a wall here, and while I'd love to start from a clean setup, I have too many other services running on the server to wipe it and go again.