http://dovecot.org/test/

Most importantly added mbox_lazy_writes option, enabled by default. This makes Dovecot do writes to mbox only with EXPUNGE and CHECK commands and when mailbox is being closed. This is the same behaviour as with UW-IMAP. Especially useful for POP3 where most users just download the mails and delete everything - with this enabled Dovecot doesn't anymore go writing X-UID headers and whatever.

Be careful anyway with this release, it seems to be working with me but mbox can get corrupted from simple mistakes.

Other important fixes include:

• handle UIDVALIDITY changes in mbox correctly
• we might have overridden others dotlock files if they were being rapidly recreated with different processes
• should fix syncing read-only mboxes (maybe dovecot.org finally stops giving internal errors :)
• fixed several other mbox syncing issues which were quite rare without lazy writing
• when sending lots of non-mail data to IMAP clients, Dovecot might have lost some of it causing weird problems. With pop3 it crashed with assert instead of losing data.