New alternatives to Roundcube are Rainloop and Modoboa I can confirm Rainloop works well with aox, as it should. It's a pretty nice webmail interface. Rainloop has some goofy CC license and cannot be deployed for commerical use without buying a license. I haven't investigated much further; it's for personal use only here. I like the fact that it supports multiple email accounts within the same login -- through one webmamil interface I can access my personal, work, and Gmail accounts. Doesn't support sieve yet, but has some integration for PGP if anyone is interested in that. This is a real webmail app meant for server deployment unlike Mailpile.
Modoboa looks like a really well put together project but I haven't tested it yet. It appears very modular and has an administration panel. It looks like a prime candidate for someone to write an extensive integration module for aox. I'll probably give this a whirl soon to see how it fares in comparison to Rainloop. Roundcube has just not been reliable for me lately...
