aol block port 25, how can my server recieve mail?

tonj · 02-22-2012, 06:18 PM

I'm running sendmail on a linux server which is connected to an aol broadband line. AOL block port 25 so how can I get round this to RECIEVE mail? Note: I've installed squirrelmail on the server which solves the problem of sending mail out FROM the server but what about people that send me mail? The whole world is sending me mail that comes in on port 25 (is that right?). Is there anything I can do?

rhbegin · 02-22-2012, 07:17 PM

Run it on another port and/or do some port forwarding with netfilter (ipchain rules).

tonj · 02-23-2012, 03:47 AM

thanks for your response but running it on another port will only solve the problem of relaying mail, I don't see how that will solve the problem of the server receiving mail, is that right? If I run telnet localhost 25 on the server it's fine, but if I try and telnet the server on port 25 from outside it never connects.

rhbegin · 02-23-2012, 09:25 AM

Quote:

Originally Posted by tonj

thanks for your response but running it on another port will only solve the problem of relaying mail, I don't see how that will solve the problem of the server receiving mail, is that right? If I run telnet localhost 25 on the server it's fine, but if I try and telnet the server on port 25 from outside it never connects.

You should be able to put in an ipchain rule for the new port number to go to 25 on your server, like nat'ing.

tonj · 02-23-2012, 10:11 AM

but all mail coming in to the server won't be on the new port number, it'll be on port 25, which the whole world is using.

rhbegin · 02-23-2012, 12:36 PM

Quote:

Originally Posted by tonj

but all mail coming in to the server won't be on the new port number, it'll be on port 25, which the whole world is using.

You can setup a nat translation utilizing a netfilter rule.

http://www.cyberciti.biz/faq/linux-p...with-iptables/

lithos · 02-23-2012, 01:30 PM

Quote:

Originally Posted by rhbegin

You can setup a nat translation utilizing a netfilter rule.

http://www.cyberciti.biz/faq/linux-p...with-iptables/

I'm sorry I don't have a solution, but excuse me "rhbegin" obviously you don't see it too.

He can't NAT the traffic because the incoming traffic is blocked at his ISP
not on his server (in this case he could do NAT)

rhbegin · 02-23-2012, 04:29 PM

Quote:

Originally Posted by lithos

I'm sorry I don't have a solution, but excuse me "rhbegin" obviously you don't see it too.

He can't NAT the traffic because the incoming traffic is blocked at his ISP
not on his server (in this case he could do NAT)

It can run on another port, 587 and it can be done.

http://www.howtoforge.com/forums/arc...hp/t-4788.html

ISP's block port 25 due to the fact they turn into a sewer of bot-networks spewing spam.