Wietse Venema via Postfix-users:
> Kevin Cousin via Postfix-users:
> > Greetings List,
> >
> > We recently had an issue and the active queue was full and slowed
> > down all new mail delivery. Is it possible to rate limit the mail
> > flow to protect smtpd from a massive mail input ?
>
> By default, the Postfix SMTP server enforces in_flow_delay (1 second)
> when the received message rate exceeds the delivered message rate.
>
> in_flow_delay (default: 1s)
> Time to pause before accepting a new message, when the message
> arrival
> rate exceeds the message delivery rate. This feature is turned on
> by
> default (it's disabled on SCO UNIX due to an SCO bug).
>
> With the default 100 Postfix SMTP server process limit,
> "in_flow_delay
> = 1s" limits the mail inflow to 100 messages per second above the
> num-
> ber of messages delivered per second.
>
> Specify 0 to disable the feature. Valid delays are 0..10.
>
> It's limited to 10s, because waiting much longer may cause clients
> to go away. Reducing the Postfix SMTP server process limit has a
> similar result as increasing the in_flow_delay.
Can you answer one question: is mail arriving too fast, or are
deliveries too slow? If the problem is the latter, then your queue
may be full of MAILER-DAEMON messages.
We have a solution for that, and that is not slowing down message
arrivals or speeding up deliveries.
Wietse
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