I'm using courier-imap quite happily for about 2 years on dozens of boxes with 2-3K users/virtual domains and 5-10K email accounts per box. These are primarily web servers, and for only a small fraction of the resources a single installation of courier-imap handles about 200-500K pop3/imap logins a day.

It's well thought, flexible and efficient. You can attach it to whatever LDA you like, for instance I'm using it with procmail, and have also another setup with maildrop. You can use whatever authentication you like - PAM, userdb, mysql, LDAP, etc.

Besides the courier-imap and maildrop, the courier project also has another somewhat mature and useful child - sqwebmail. It's a basic CGI-based webmail client, which is very fast (works directly with the maildirs). So accessing large folders with imap, pop3 or webmail is not a problem.

It's not that much of a rocket science to configure it, especyally when you have it almost preconfigured in FreeBSD ports. I can post some sample configuration hookups if someone is interested.

Regards,
Atanas
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