Brain Goo

Denying connections based on RBLs is a snap with Exim4. Most confusion is related to ACLs and where the definition sits.
The fastest way to deny based on RBL is to add it to whatever ACL you specify in acl_smtp_rcpt
However, you MUST put the declaration AFTER any relay allow definitions. ACLs are based on [...]

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How to set up virtual email domains and users with POP access on Debian Sarge
http://www.randomsequence.com/articles/smtp-pop3-email-for-virtual-users-on-debian-sarge/
Adverts:
The Exim SMTP Mail Server
Exim: The Mail Transfer Agent
The Exim SMTP Mail Server: Official Guide for Release 4

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How to set up virtual domain hosting in Postfix.
http://www.postfix.org/VIRTUAL_README.html

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