= Postfix/Mailbox_quotas =

This is a bit messy because quotas can be implemented in many ways. Dovecot is a nice LDA, but it doesn't have ''trivial'' quota support. Also, you need a [[Postfix/Rejecting_over-quota_during_SMTP_transaction_with_LDA| hack]] if you want to reject during the initial transaction.

Dovecot's quota docs: http://wiki.dovecot.org/Quota

A not-bad alternative is to periodically populate a table with over-quota mailboxes, and use an [[http://www.postfix.org/access.5.html| access table]] in your smtpd restrictions. This might take a while if you have lots of mailboxes.

Consider a policyd service that queries mailbox sizes on demand. Or uses Dovecot's maildir++ quota files.