The email feature looks interesting but I would be considered that my Xenforo might get blacklisted for whatever reason, for sending out emails. Is it possible to use an outside SMTP server to send all member emails, replies, newsletters, followup etc?
No update. But, be careful with aweber/mailchimp/whatever on a bulletin board.
I used it on vbulletin and I got lots of subscribers very quickly but the return on the investment was always < 0 ! (read: I always lost money )