[Dovecot] quota plugin + setting in "protocol" or "lda"

hi...

which are the diference to configure quota plugin when LDA is dovecot:

these setting:

protocol imap { : mail_plugins = quota imap_quota : } protocol pop3 { : mail_plugins = quota : }

.vs.

these setting:

protocol lda { : mail_plugins = quota : }

Note: - dovecot version is 1.2.0

thanks in advance!!

-- Salu2 ;)