Hello, I've got border MTA (postfix + antispam) and MDA (postfix + dovecot) where emails are delivered to. Users on MDA are limited by dovecot-based quota.
How can I pass information about "this user's quota is reached, do not receive email for him and reject it with relevant 5xx message" to the border MTA so I can reject emails for particular users with quota reached already on a border MTA and dont cause a backscatters? And one sub-question :) - how does postfix on MDA finds that particular user has full mailbox and rejects emails for him? Does it count a file-system mailbox size on every SMTP connection or does it have this information from dovecout (ie via database or so)? Thanks. Best regards, Jorge
