[Dovecot] Issues w/ Apple devices after migration to dovecot

[Timo Sirainen]

On 1.2.2012, at 1.16, Armistead, Kurt wrote:

> Recently we've moved our old (and I mean _really_ old) mailserver to a new
> hardware. Since I had quite some time on my hands, I decided to switch
> from courier to dovecot. Transition went pretty smoothly and the users
> experienced just a few hours' blackout.
> 
> Only trouble now is that, after re-configuring some IOS handsets and
> tablets, not all messages are displayed correctly.

Did you use the courier-dovecot-migrate.pl script? If not, Dovecot set new IMAP UIDVALIDITY and UID numbers to mails and the problems are most likely related to clients not realizing that they should drop their internal caches.