Rohit Shriwas:
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> I should add I have the following limits set in master.cf as well:
>
> smtp unix - - n - 10 smtp
> relay unix - - n - 10 smtp
>
> I think this, along with the following in main.cf:
>
> default_destination_rate_delay = 1s
> default_destination_concurrency_failed_cohort_limit = 10
> default_destination_recipient_limit = 1
>
> _should_ restrict outgoing mail to no more than 10 per second. Thoughts?
Not at all. As documented this limits mail delivery rate PER
RECIPIENT ADDRESS, because you are setting "_recipient_limit = 1".
To limit mail PER TRANSPORT use relay_transport_rate_delay and
smtp_transport_rate_delay.
Wietse
