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Old 3rd June 2013, 10:02
till till is online now
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Here is a current tutorial for hardening postfix:

http://www.howtoforge.com/hardening-...or-ispconfig-3

Please note that its very strict and the use of e.g. postgrey will slow down the arrivalof the first email that someone sends to you.

The tutorial is for debian but it should work similarily for centos.
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