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Old 13th February 2012, 09:14
till till is offline
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I would like to know, however, why after following the Ubuntu guide, having set it up directly as you said, that I am able to relay via my server from a random client, on a random ip address to ANY external email provider without any form of authentication on port 25 without glitch?
The Ubuntu guide does not result in a open relay normally. So there was either a misunderstanding while you tested the server (e.g. you tested to send a email to a domain which was configured as local on the system instead of using a test like this one:

http://www.abuse.net/relay.html

Or the server was a open relay before.

To give you a more detailed answer, post the contant of the /etc/postfix/main.cf file and the result of the relay test that i posted above.

Regarding Centos, I wont use that on a production system. Better use Ubuntu or Debian.
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