It's a complex application.
Do you really need your own?
i dont NEED to know.
over on phpBB.com some one asked for a mod that gave there forum the ability to view emails on the server as well, just like PM's. thought i might look into it.
a few months ago i was looking through the PHP books in PC World and found one dedicated to email server access (or what ever it was called) but PC World are slowly dwindling there stock of books down to make room for more copys of Norton Anti Virus, like 2 iles of the same rubbish isnt enough.