9 May
2011
9 May
'11
5:44 p.m.
I don't know how firmly you want to stick with dovecot/postfix, but an equivalent stack (cyrus/sendmail) is part of the base distro and of course works well with sieve, is fast, and scalable. Adding Horde (which isn't part of the base distro) gives a good web-based interface to sieve in addition to its usual webmail and other features.
Devin