(n.b.: this is SMTP, we must account for out-of-order delivery)
* search, Xapian bindings are pretty common on GNU/Linux distros
* NNTP server (is there demand for one?)
+* improve + document mlmmj integration, currently only at:
+ http://bogomips.org/unicorn-public/m/20140508084301.GA2033%40dcvr.yhbt.net