On 21.6.2012, at 21.05, email builder wrote: > We are building a new system that will support a large number of users (high > volume, high concurrent usage, etc). We have played with Dovecot, but in > most serious applications we have traditionally used Courier IMAP. It's my > (lay) understanding that with indexing and perhaps other things in Dovecot, > it might perform better than Courier in larger environments like this. Am I > correct or is it less clear-cut?
If you disable index index files in Dovecot, its performance should be slightly better than Courier. With index files the performance is typically much better in Dovecot, especially if you use a (non-caching) webmail. > Any tips on making the migration (not migrating an existing system, I mean > migrating our paradigm - things to consider, things to watch out for)? If you don't migrate any existing users, I guess this doesn't differ much from any other optimized Dovecot installation. Usually large installations (>1M users) use NetApp NFS + Dovecot director. You might also want to enable full text searches. http://wiki2.dovecot.org/PerformanceTuning lists some other things.
