Start here
with installation:

Download

1.

Exim MTA

2.

Courier-IMAP

3.

MailAdmin

4.

SpamAssassin

5.

Clam AntiVirus

6.

Config Files

7.

Reboot/Testing

8.

Debug

SquirrelMail

SqWebMail

RBL

Blocking IPs

Mailman