Wietse Venema:
> Yoda via Postfix-users:
> > Our updated tuning rules:
> >
> >
> > - Minimum rate_delay is 1s. Sub-second is architecturally
> >
> > impossible at the rate_delay knob, full stop.
> > - Always set time values at default_destination_* (qmgr fatals
> >
> It is possible if you can afford to configure multiple delivery transports
> that have parallel rate delays.
>
> Below is an old posting.
>
> Wietse
>
> > > I'm working in an email marketing firm, we send more than 50 millions of
> > > emails per month, and use postfix for that, and can't resolve a problem
> > > with transport for gmail, in destination_rate_delay, only
> > > accepts integers, why can not use a float?
> >
> > The rate delay feature was implemented for end users with an ISP
> > that allows only a limited volume of outbound email (less than
> > 3600/hour). It turned out to also help for sending mail to providers
> > such as Hotmail with very low rate limits.
> >
> > The rate delay implementation does not work well for bulk mail,
> > because it limits the concurrency to only one delivery at a time.
> > So the proper fix is not changing ints to float, but allowing more
> > than one delivery at a time.
>
> However, you can increase concurrency by using multiple SMTP
> transports and random selection.
Damn!. Cut and paste error.
Wietse
In /etc/postfix/master.cf:
smtp1 unix - - n - - smtp
smtp2 unix - - n - - smtp
...
smtpN unix - - n - - smtp
smtp1_destination_concurrency_failed_cohort_limit = 10
smtp2_destination_concurrency_failed_cohort_limit = 10
...
smtpN_destination_concurrency_failed_cohort_limit = 10
In /etc/postfix/main.cf:
smtp1_destination_rate_delay = 1
smtp2_destination_rate_delay = 1
...
smtpN_destination_rate_delay = 1
transport_maps =
inline:{
{ $myhostname = $local_transport }
{ localhost = $local_transport }
{ localhost.$mydomain = $local_transport }
# Other domains that don't deliver over SMTP...
} randmap:{ smtp1:, smtp2:, ..., smtpN: }
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