[Dovecot] get maildir current quota usage from external program

[Allison Vollmann]

Hello,

i want to get the maildir current quota usage of an user, but i'd know 
what is the better way to do.

in imap clients my quota usage, in example, show: 505KB, but if i sum 
only the size of each message from Maildir, i get total: 440KB, trying 
to use real and apparent block size but the sum differs from value 
showed in imap client.

is quota usage based on why, have another way to do this?

thanks