One thing notably missing from most webmail providers is access to IMAP, and access to server-side filtering. Well, thanks to Cyrus we are now providing just that at http://fastmail.fm -- an IMAP accessible, Sieve enabled, email system.
I just finished the Sieve interface yesterday. If you can't be bothered getting a FastMail account to see it, I've got a screen-shot here: http://www.fastmail.fm/docs/DefineRules.htm The nice thing about Sieve was that I didn't have to worry about users creating insecure scripts, since Sieve scripts have limited ability to do damage. The interface supports wildcards by creating the 'match' comparator as appropriate, although I'd like to support regexs--is that available in Cyrus at the moment (I know there's an internet draft around for it)?
