Installing Cyrus with Multiple Domains

I am currently in the middle of a project at work to replace an NT IMail server with a linux open-source replacement. It's been a long adventure, and it's not over. But I have found a lot of things, and I will be documenting my findings here.

The biggest roadblock in my project is that I must support multiple domains. I've found a few ways to this, most of which I wasn't pleased with. Then I found one great way, and it used SASL authentication. I've documented the process thoroughly here. I'm currently working on adding SQL behind it so I can add other functionalities. As soon as that is done, I will be posting docs on that.

One important note: This method requires one IP address for each domain!

Using SASL as authentication - The original method I found. I've documented the process thoroughly, including using SSL and setting up Sendmail (postfix coming soon).
Using SQL as authentication - Here is the initial documentation on my working SQL setup. More work needs to be done, however.