[Exim] Exim pop3 - Where to start?

Hello,

I need guidance. I am new to Debian an Exim. More specifically, I need help figuring out what packages would work best for my needs.

I would like to setup a pop3 server using Exim so that potential customers and clients can securely pop and push mail on and off the server.

Current configuration:
- one mail user
- mailman is running
- exim is running with inetd.conf configuration Exim version 3.12 #1 built 08-Jun-2001 14:21:07

Project Needs:
1. encrypted email from client to server
2. easy setup/ administration (If possible apt-get install X, but I can also install from source.)
3. multiple virtual domains (potentially 10-1000) with 1-5 email addresses per domain
4. fair to good performance with high stability
5. the option to create virtual domain mailman lists in the future (FAQ C041).

I have heard Ldap, cyrus, and mysql all thrown around on the list, but I am not sure how they all work together. Any clarification or references to documentation that clarify the usage of Exim with databases would be greatly appreciated.

-Ted