* configurable constants (quote folding, index limits) * use tags as date-based skiplists for navigating history * per-message views should be able to quickly navigate to replies. (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