Seth Mattinen, 2009-05-15 09:39:
(right?) and so can dovecot, so should i use dovecot's "deliver" mechanism, or exim's own internal mechanism? Only dovecot 'deliver' will update the index on delivery.
That's obvious. But dovecot (AFAIK) updates (not rebuilds) indexes when it sees new messages, so it should not matter that much. At least with maildir and not too much messages in poll intervalls, so usual "always on" imap usage should be ok. It might be even better not to use dovecot-lda for heavy-usage systems, because you save the fork/exec and indexes are updated on demand (i.e. when the folder is polled), not for every single message inserted.
With exim, I had also the problem that messages got bounced because the lda crashed occasionally (was a svn version, so I don't complain) and stupid exim treated this as a permanent error.