Just an observation...I noticed this the first time I installed the toaster, and now just again on another machine.
When doing the "./configure" for Squirrelmail, the toaster says: "go to Server Settings (2) and change the Server Software from "cyrus" to "courier" (a)". Well, I think it's a little different now. you can get to "Server Software" from 2.(a) then "8", but it looks like there is another option from the main menu: "D. Set pre-defined settings for specific IMAP servers" which I'm assuming does the same thing and is easier to locate. -Hank