[imp] Using vinfo in IMP 3.1

[Eli]

I am trying to set up IMP for a webhosting company that also does email,
and we need some way to allow users to simply log in by using their
email address and password.

I was told about the vinfo stuff, and I took a look at it, but I'm at a
loss of how to get the login info the user specifies.  I know PHP, so I
can write the code myself, but I don't have a clue where to get/store
the data that I'd be parsing.

I need to know how to access the data the person gives at the login page
(the username) so I can parse it, and then I need to know where I can
store the following pieces of data I would get from parsing it:  the
server, the maildomain, and the smtphost.  Also, I wonder if I would
just be editing the settings for a pre-defined server from the
servers.conf, or what?  The server type would be IMAP, and right now I
have all the example servers commented out.

Thanks in advance,

Eli.