What ports to open for mail server?

Posted by radman on Server Fault See other posts from Server Fault or by radman
Published on 2010-06-10T02:03:58Z Indexed on 2010/06/10 2:12 UTC
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Filed under:

postfix

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smtp

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emailserver

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port

Hi,

I have just finished setting up a Postfix mail server on a linux (ubuntu) platform. I have it sending and receiving email and it is not an open relay. It also supports secure smtp and imap.

Now this is a pretty beginner question but should I be leaving port 25 open? (since secure smtp is preferred). if so then why?

Also what about port 587?

Also should I require any authentication on either of these ports?

Please excuse my ignorance in this area :P

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