[Dovecot] Logging IMAP transactions

[Kenneth Porter]

Mulberry has the ability to log the IMAP exchange client-side. Is there an 
equivalent logging feature in Dovecot (0.99) to log the IMAP exchange 
server-side?

My problem is that Mulberry is displaying some complex MIME structures 
incorrectly (eg. nested/forwarded messages) but it seems to go away if I 
close a folder and re-open it. I'm suspecting that Dovecot is reporting the 
wrong structure on first access and then fixes something on subsequent 
accesses. I'd like to log the FETCH result with the structure information 
to see if I can spot this happening.