Since dbmail supports mail quotas, I was testing to see if the IMAP server supports the QUOTA extended command to check quota, and it's not listed in CAPABILITY or as the QUOTA command itself..
Granted, right now the QUOTA extensions are not in any RFC's, only drafts, but provided here is a link to a draft document of the proposed extension: http://www.ietf.org/internet-drafts/draft-cridland-imap-quota-00.txt -- Eric Renfro Myrddin Computers & Designs - CEO/President
