mail_attachment_detection_options not working

Hi,

I enabled mail_attachment_detection_options on dovecot 2.2.34, in 10-mail.conf I have:

mail_attachment_detection_options = add-flags-on-save

but when an email is delivered in mailbox (Maildir) via LMTP no flag (HasNoAttachment or HasAttachment) was added.

In dovecot-keywords file I have:

0 $HasNoAttachment 1 NonJunk 2 $HasAttachment

so I thinks that the feature was eanbled but is unable.

What am I doing wrong?

Thanks

-- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice