Mail Avenger

Mail Avenger is a super customizable SMTP server daemon that doesn't tie you to any specific MTA. What’s cool about it is that it processes messages through filters like ClamAV and SpamAssassin while they’re being sent, meaning it can reject unwanted emails before actually taking on the job of delivering them.

Unique Features of Mail Avenger

This software has some pretty unique features! For instance, it includes TCP SYN fingerprinting and network route recording. Plus, it verifies sender addresses using SMTP callbacks. It also supports SPF (Sender Policy Framework) for setting general email policies. You even get control over both SMTP-level behavior and the local delivery of extension addresses, along with mail-bomb protection and integration with kernel firewalls.

Compatibility

You’ll be glad to know that Mail Avenger works on Mac OS X, FreeBSD, OpenBSD, Linux, and likely runs smoothly on other Unix-like systems too!

Advanced Filtering Options

When you compare Mail Avenger to traditional spam filtering methods like .forward or .qmail, you’ll see it offers more options during the SMTP transaction. For example, you can reject emails with an SMTP error code instead of bouncing them back if they're coming from a legitimate mail transfer agent (MTA), not just a spambot.

Data Collection for Better Accuracy

This software collects tons of valuable info about SMTP connections from clients! It captures TCP SYN fingerprints (which often reveal the client's operating system) and network route data. If known senders start acting differently than usual, you can flag those anomalies easily. All this info is recorded in a new mail header called X-Avenger:, which can then be used by Bayesian content filters to enhance accuracy.

Main Features Overview

• Mail-bomb protection: Stops one client from overwhelming your server.


• SYN filtering: Adjusts kernel firewall rules as needed.


• Network-level traffic analysis: Gathers TCP SYN fingerprints and more!


• Email verification: Ensures senders can handle bounce messages.


• SCRIPTING AID:

If you're looking for a robust email management solution that gives you full control over your server's email handling capabilities, check out Mail Avenger today!