dbmail-3.2.3: empty fetch response on noop command

Hello,

My imap client fails on noop server response. Is it problem in my
client or in dbmail?

I do following:
- send email and save it into Sent folder on dbmail
- try to check new email and client fails with "unexpected )"

I checked traffic dump and find following conversation:
- elmo-imap448 noop
- * 510 FETCH ()
- elmo-imap448 OK noop completed

As I understand my client expects something in () in FETCH
response. And fetch reponse is ok because of new email appeared in
Sent folder. I am not familiar with imap protocol but I guess my
client wants ID of new email in () or something like this.