On Mon, 22 Feb 2016, Wietse Venema wrote:

If you did not change any of the _destination_recipient_limit
settings, this will send 240 messages per hour to the ISP. It also
rate-limits all other Postfix delivery agents (local delivery, in
particular).

Wietse,

  I can live with a 15s delay locally; incoming mail is never heavy as there
are only a couple of us users here.

For example, one would use smtp_destination_rate_delay to rate-limit only
deliveries with the "smtp" delivery agent.

  That's what I thought.

You should set default_destination_concurrency_failed_cohort_limit=10
in main.cf (or smtp_destination_concurrency_failed_cohort_limit=10
if you decide to use smtp_destination_rate_delay instead of
default_destination_rate_delay).

  I've no preference and will use both smtp_destination_rate_delay and
smtp_destination_concurrency_failed_cohort_limit.

Thank you very much,

Rich

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