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Linux Email: Set up and Run a Small Office Email Server by Patrick Ben, Magnus Back, Alistair McDonald, Carl Taylor, David Rusenko

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Chapter 5. Securing Your Installation

Of all the bad things that can happen to your SMTP server, the worst is probably having it abused as an op en relay—a server that relays mail for third parties without your permission. This will consume a lot of bandwidth, eat up server resources, and cost you a lot of money. Worse than that, your server will end up on a blacklist, and any server consulting this list will refuse to accept mail from your server until you have proven it to be relay-safe. If you need your mail server for business, you will have a big problem.

This chapter will tell you how to protect Postfix from relay abuse. You will l earn the difference between statically and dynamically assigned IP addresses when it comes to relay protection. ...

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