Exim for a not too big provider / corporate network

It just so happened some time ago I wrote an article about setting up Exim under FreeBSD with blackjack and harlots issuing rights to administer their domains and even mailboxes to relevant users, good spamming, etc., but by that time I didn’t have an account on Habré. Therefore, I will provide a link in the personal name of Habr, maybe someone will come in handy, since quite a few people have already naggulili and say thank you. I will make a reservation, however, I hardly will give explanations on difficult things - the article was written in late December, now July, much forgotten, but in order to sit and understand this wilds again, now there is ugly little time.
So, the Mail server, as at provider .