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postfix listening port

Hi All,
I just completed the wonderful postfix spamassassin tutorial located at http://www200.pair.com/mecham/spam/s...r20060630.html and everything seems to have gone ok.

I realized afterword that the isp this server is hosted on blocks traffic on port 25 so I need to adjust my postfix settings to get it listening and relaying on port 587.

I added the following entry to my iptables:

Code:

iptables -A FIREWALL -p tcp -m tcp --dport 587 --syn -j ACCEPT

And the following line to my master.cf

Code:

127.0.0.1:587 inet n - n - - smtpd

But I still can't connect on 587. I am testing this on the local network and port 25 is responding via telnet without any problems. There are no errors in my mail.log file and grep 587 /etc/services give me:

Code:

submission      587/tcp                         # Submission [RFC2476]

submission      587/udp

Any thoughts on what I missed to get this thing listening on port 587? Thanks much.

might be nicer for yourself if you just leave postfix alone and do a port translation on the network:

Code:

iptables -t nat -A PREROUTING -p tcp --dport 587 -j REDIRECT --to-ports 25

this way postfix remains unmessesboutwithandllathat

Thanks for the excellent suggestion. I'm getting on with 587 locally now.

and of cource locally port 25 still works fine within your lan and the machine itself.

It sure does. Thanks for all the help