In the event that a message is wrong, a sender isn't real or any number of other problems, dealing with bounced messages is a pretty important part of email servers... If you're using Postfix for your email needs... This guide shows how to configure ...
I confess, I'm an outlaw at heart. I like using packet sniffers like tcpdump because it satisfies my base snooping impulses. Packet-sniffing is wiretapping after all, only it's applied to TCP/IP packets, not voice transmissions. Sure, they're my packets on my systems, but still the idea is appealing.
Did you know that you can use tcpdump to verify that encryption on your POP email server is working? Find out how in this informative tutorial from Carla Schroder.
In the event that a message is wrong, a sender isn't real or any number of other problems, dealing with bounced messages is a pretty important part of email servers... If you're using Postfix for your email needs... This guide shows how to configure custom Postfix bounce messages.
Do you use Windows? Do you want to use GnuPG? Are you new to GnuPG in a windows environment? Then look no further! This document was written for new users who have never installed or used GnuPG before and have not perhaps done any reading but just wish to "dive right in and get started" using signing and encryption. If this is the case, please take your time to read through the whole document first skipping the update instructions (which make up significant portions of the document now). Be sure that you are comfortable with all the terms etc. before doing anything!
Are you using SpamAssassin, but the rulesets you currently have aren't seeming to do the trick?
This article explains how you can download additional SpamAssassin rulesets resp. automatically update these rulesets with a shell scripts called RulesDuJour. These additional rulesets can increase your spam recognition rate dramatically.
This HOWTO, from Howtoforge.com provides a great look into how to leverage the best defense against spam on your mail server. Great overview with setp by step instructions:
This document describes how to integrate ASSP (Anti-Spam SMTP Proxy) with embedded ClamAV into a mail server based on Postfix featuring virtual users and domains, i.e. users and domains that are in a MySQL database.