I think this type of thing is addressed with LMTP, right? 

On Wednesday 20 October 2004 10:11 am, Jacques Dimanche Test wrote:
> After setting up the dbmail to work with sendmail, I can receive email
> messages just fine in pop3 and imap.  Playing around with the user
> settings, I wanted to change my mailbox size to a lower limit to see
> what happens when I exceed my limit.   After making the change, in such
> that I have actually exceeded my mailbox size, I tried to send myself a
> limit and got the following error:
>
> Oct 21 01:02:52 localhost sendmail[4271]: i9KH2q27004269:
> to=<[EMAIL PROTECTED]>, ctladdr=<[EMAIL PROTECTED]> (0/0),
> delay=00:00:00, xdelay=00:00:00, mailer=dbmail, pri=30307,
> relay=home.sysads.com, dsn=4.0.0, stat=Deferred: dbmail mailer
> (/usr/local/sbin/dbmail-smtp) exited with EX_TEMPFAIL
>
> Is the above normal behavior?  That all incoming messages that exceed
> mailbox size is just accepted until the mailer decides to give up on it
> and send it back?  Reason I ask, is that in a large user environment,
> such as an ISP, this could lead to a large queue of messages that will
> be processed every 15 minutes (or however you have your queue check
> interval set at) until space either frees up or how long you have your
> hold time before bouncing the message back.
>
> Is it possible to bounce it back right away with a simple message
> stating that the user's mailbox size has been exceeded and that the
> message is undeliverable?
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