What do I need to do to prevent exploitation of my postfix server?

Posted by Josiah on Server Fault See other posts from Server Fault or by Josiah
Published on 2010-05-09T02:18:00Z Indexed on 2010/05/09 2:29 UTC
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I have a a web server that needs to send emails, but not recieve them. I have installed postfix (it came with nagios, also installed on this server) and now I need to make sure that my server does not get used as a spam server.

What steps do I need to take to ensure that this does not happen?

What additional security measures do I need to put in place?

Server is Ubuntu 10.4

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