[Dovecot] Applemail did not sync when MailTags enabled

[mailinglists at belfin.ch]

Hi

I run dovecot 1.2.11. One of my users turned on MailTags in his AppleMail
with the effect that he could not anymore synchronize his imap folders. No
error message, just endless waiting.

Has anybody experienced a similar behaviour?

Thanks
John