On Tue, Aug 06, 2013 at 09:27:20PM +0300, Timo Sirainen wrote: > On 6.8.2013, at 20.57, Thomas Leuxner <t...@leuxner.net> wrote: > > * Timo Sirainen <t...@iki.fi> 2013.08.06 19:42: > > > >> 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. > > > > I'm referring to the Postfix side _only_ or the initial SMTP > > Handshake if you like. My point is that there is no safe way > > to reject mails at this level *if* the remote server doesn't > > play nice. I think this was the whole point of writing a > > policy service for Postfix. I'm not *talking* about quotas > > that will be handled by the delivery agents... > > Either you're still misunderstanding me, or vice versa. The quota > rejections can be done complete in SMTP side even without SIZE:
Another way, in Postfix, is to wait for end-of-DATA. Regardless of SIZE being given, at that point, the actual size is known. Of course as Thomas would probably point out, such a rejection is unsafe, because ANY overquota recipient would cause rejection for EVERY recipient; SMTP cannot have per-recipient results except at "RCPT TO:". Personally, I'd much rather allow the last overquota mail, even in cases where the user goes far over the quota. Apparently Thomas intends to have a solid, inflexible quota. In that case I'd suggest going for a lower quota and adding quota_grace. Let quota_grace plus quota be the most you can tolerate in your users' mailboxes. > 1) quota at 99% : > > MAIL FROM:<sen...@example.com> > 250 2.1.0 Ok > RCPT TO:<t...@dovecot.org> > 250 2.1.0 Ok > DATA > ... > . > 250 2.0.0 Ok: queued as 12345 > > 2) quota is now at 103% : > > MAIL FROM:<send...@example.com> > 250 2.1.0 Ok > RCPT TO:<t...@dovecot.org> > 554 5.2.2 User is over quota > -- http://rob0.nodns4.us/ -- system administration and consulting Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
