On 6.8.2013, at 19.25, Thomas Leuxner <t...@leuxner.net> wrote: > * Timo Sirainen <t...@iki.fi> 2013.08.06 18:15: > >>> Now the real problem along the road is the submitting server. If that >>> server does not indicate the message size during handshake the pre-queue >>> rejection simply can not work. >> >> quota_grace was meant to solve that. You'll allow the user to become a bit >> over quota. > > What I meant is before the mail enters the Postfix queues. If the SIZE > extension is not used during MAIL FROM by the remote server, then there's no > way to reject an over-quota mail upfront, losing the benefit of the policy > service.
The idea behind quota_grace is that the last mail would be allowed to take the user somewhat over quota (e.g. up to 109% quota usage). On the next mail delivery user is already over quota, so the size of the mail is irrelevant because a mail of any size will be rejected. The initial quota-status implementation didn't even support SIZE extension since I didn't remember it existed.
