Rather interesting. I still like building the whole thing with postfix + dovecot by hand myself. Perhaps I'm wrong in the head.

One thing to watch out for: Yahoo is a complete bastard to deliver to. One day they'll decide to block you (if they don't immediately) and the only way out is to fill in a web form which either allows you 6 months of delivery if you're lucky or blocks you with no hope of resolution for 6 months.

Total assholes they are.