[Dovecot] MUA notifications on new mail in a new folder?

[Kārlis Repsons]

If deliver gets run with a non-root userid like this:
< | deliver -m path/to/NEWmaildir >, I wonder, is a connected IMAP MUA
automatically notified, that the new message has arrived in the new folder?
As I see from some experiments with Thunderbird, it has no problems with 
immediate notifications of new mail in previously existing folders, however, it 
has problems with the case of new folder.
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