In This tutorial i will write a steps how to configure postfix to working with dspam and clamav.
So if you search my site for Postfix Cyrus SASL, Mysql, Postfixadmin, Courier Authlib and Courier Imap you can click here

So What is Dspam ?

What is ClamAV, Amavisd-new and Spamassassin?

Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. The core of the package is an anti-virus engine available in a form of shared library.

If you have a cpanel server and you've a problem with your crontab permission are wrong please set to 4755.

Please kindly to follow up this step below to solved your crontab permission issue.

Anyway, if you get the message:
================================
/usr/bin/crontab permissions are wrong. Please set to 4755

You can fix it by logging in via ssh/root and giving it some:
=============================================================
[code]$chmod 4755 /usr/bin/crontab[/code]

AWStats is a free powerful and featureful tool that generates advanced web, streaming, ftp or mail server statistics, graphically. This log analyzer works as a CGI or from command line and shows you all possible information your log contains, in few graphical web pages. It uses a partial information file to be able to process large log files, often and quickly.