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Postfix with dkfilter (DomainKeys Implementation)
DomainKeys is an anti-spam software application in development at Yahoo that uses a form of public key cryptography to authenticate the sender's domain. dkfilter is an SMTP-proxy designed for Postfix. It implements DomainKeys message signing and verification. It comprises two separate filters, an "outbound" filter for signing outgoing email on port 587, and an "inbound" filter for verifying signatures of incoming email on port 25. This document is to describe step by step how to install dkfilter for postfix to deploy domainkeys signing and verification.
Set Up Ubuntu-Server 6.10 As A Firewall/Gateway For Your Small Business Environment
This tutorial shows how to set up a Ubuntu 6.10 server ("Edgy Eft") as a firewall and gateway for small/medium networks. The article covers the installation/configuration of services such as Shorewall, NAT, caching nameserver, DHCP server, VPN server, Webmin, Munin, Apache, Squirrelmail, Postfix, Courier IMAP and POP3, SpamAssassin, ClamAV, and many more.
SIEVE Language for Mail Filtering Quick Guide
SIEVE is a language created and used for mail filtering that broadens the filtering options generally provided by mail servers or Antispam/Antivirus applications. They work basically by comparing different keys using different comparators and comparison methods, against headers of a mail message. Based on the result of the comparison, you can apply different actions to the corresponding mail message, i.e. reject, discard, redirect, etc.
Enhance Your Mail Server With ASSP (Anti-Spam SMTP Proxy)
ASSP stands for Anti-Spam SMTP Proxy. The ASSP server project is an Open Source platform-independent transparent SMTP proxy server that leverages numerous methodologies and technologies to both rigidly and adaptively identify spam. In short ASSP is the most kickass solution that is both free and works great. It reduced spam to an absurd minimum for me.
How to Build an Effective Mail Server Defense
When speaking of mail server-related security, one
tends to limit the issue to message applied security measures, and even
more to Antivirus and Antispam protection. This is however only one
stage in the more complex process of securing your server. This article
aims at identifying and explaining all security layers, highly important when choosing a certain mail server and consequently when configuring and using it.
Virtual Users And Domains With Postfix, Courier And MySQL (Fedora Core 5)
This document describes how to install a mail server based on Postfix that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses.
How To Combat Viruses Using Your Postfix Configuration
In this guide you will learn how to tweak the HowtoForge mail guide
for Postfix (+Auth SMTP + Quota),
http://www.howtoforge.com/virtual_postfix_mysql_quota_courier, setup to give better Virus protection. Sadly this always comes at a price as you will see later on.....
How To Fight Spam Using Your Postfix Configuration
In this guide you will learn how to tweak the mail guide for Postfix (+Auth SMTP + Quota), http://www.howtoforge.com/virtual_postfix_mysql_quota_courier, setup to better combat SPAM and allow a little bit of backward compatibilty of the older Qmail systems.
Postfix Spam Filter using Ubuntu Dapper, MailScanner, SpamAssassin, Rayzor, Pyzor, DCC and ClamAV
This is a similar version of the HOWTO that can be found here: http://www200.pair.com/mecham/spam/spamfilter20050628.html.
Except for using Ubuntu Server instead of Debian and MailScanner
instead of Amavisd, the Postfix, Rayzor, Pyzor, DCC and ClamAV sections
are almost the same.
Killing That Spam With Postgrey And Postfix
Ever heard of stopping spam with greylisting?
This tutorial will show you how to setup greylisting with Postgrey and Postfix on Debian. Greylisting will not replace spam filtering software like SA but it will serve as a powerful first hurdle for spam thus reducing the ammount of spam entering the system at all.