David Walser wrote:

Forgive my ignorance but what is SIEVE?

It's a scripting thing, you can do a lot of things with it, but it's main use is server-side filtering of e-mails. Currently with any other IMAP server, say you have some folders, and you want to filter some mails into the different folders. You do your filter in Mozilla Mail, and then don't get run when you use SquirrelMail (webmail), or vice versa. SIEVE does all the filtering when the messages are delivered on the server (rather than when you check your mail), so it's consistent across all IMAP clients, and also there are nice GUI and web-based tools for configuring SIEVE filters.
Sieve isn't the only strength of cyrus-imapd. You can have shared folders (courier cand do that too but it's a kludge) and ACLs on all folders (you can give limited or complete access to your own folders to other users, and AFAIK courier cannot do that).
Cyrus-imapd is also fast, since it's message store (or better, the metadata database) is optimized for imap access, while a maildir storage isn't.

Bye

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Luca Olivetti
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