On Fri, Nov 12, 2010 at 10:06:46AM -0800, Rob Tanner wrote:
> Our admissions office sends out mass mailings to prospective students,
> anywhere from 5,000 to 25,000 at a time. They are mail-merged and sent via
> outlook to the postfix server, one recipient per message.
I am skeptical that it is in fact one recipient per message. Check your
logs carefully. Do all the recipients get different queue-ids?
> The user reports
> that outlook sends out 500 messages and then stops. If he restarts outlook,
> it will send out another 500 and then stop again. If he leaves it
> overnight, it might send several more thousand by morning. When I look in
> the mail logs, somewhere around 500 messages, followed by a disconnect.
The client disconnects voluntarily, unless it exceeded an error counter.
Postfix has a hard and soft error limit, but these are reset after each
successful delivery. So exceeding the limits on consecutive errors should
be infrequent.
> What I don?t know is whether outlook is disconnecting or whether postfix is
> closing the connection. Is there a limit, configurable or otherwise, to the
> number of messages postfix can receive on a single connection? And at that
> point, does postfix close the connection to the client?
Postfix would log the reason if it forced a client disconnect.
--
Viktor.
