Tom Collins wrote:
Courier-IMAP seems to be putting a heavy load on my server when someone
accesses a mailbox with a large number of messages in it. I recently
scanned the mailboxes on my server, and sent some notices out to clients
who had boxes with old, unread messages in them. I think that today
some have gone online to pick up that mail, and I'm suffering the
consequences (server load of 14.0+).
What's the preferred IMAP server for a machine that will have 100-200
connections (plan for growth...) but may have an occasional mailbox with
1000+ messages in it. I've searched the archives and tried to google
for "imap server performance" and "imap server comparison" but haven't
come up with much after an hour.
My impression is that Dovecot performs well, better than courier, but
I'm wondering if anyone can offer up some real-world numbers to help me
make my decision.
On a folder with 15K messages in it, Courier took well over 2 minutes to
open it (Thunbderbird as the email client). Dovecot took under 45 seconds.
I never did check the load though.