[Mimedefang] mimedefang configuration

[Sailaja.Mulakaluri]

I am working on setting a milter for my sendmail server. I am using
mimedefang.
I want to know what are the configuration files that are to written in
and what process to be followed?
I want my milter to do the following..
1. Block attachments greater than 2.5 MB
2. Block Spam based on parts of message
3. Block messages which contain virus
4. Block files by file extension

Is there anyone who has done these?
I found that mimedefang-filter in /etc/mail is to be written with the
config details.
But, being a beginner to mimedefang i am not able to write the rule
sets.
Help is appreciated.

Thanks in advance.

Sailaja.Mulakaluri