Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




Postfix Documentation
Previous Page Home Next Page

Principles of operation

An external content filter receives unfiltered mail from Postfix (as described further below) and does one of the following:

  1. Re-inject the mail back into Postfix, perhaps after changing content and/or destination.

  2. Reject the mail (by sending a suitable status code back to Postfix). Postfix will return the mail to the sender.

NOTE: in this time of mail worms and forged spam, it is a VERY BAD IDEA to send viruses back to the sender address, because the sender address is almost certainly not the originator. It is better to discard known viruses, and to quarantine material that is suspect so that a human can decide what to do with it.

Postfix Documentation
Previous Page Home Next Page