System Support:
>
> I send several weekly newsletters where a number of the e-mails
> are all relayed to a separate host. I would like to rate limit
> the traffic to this host. I tried using:
>
> smtp_destination_concurrency_limit = 5
smtp_destination_concurrency_limit has no effect when you turn on
smtp_destination_rate_delay. It specifies a delay BETWEEN deliveries,
meaning the deliveries cannot be in parallel.
> smtp_destination_rate_delay = 1s
> smtp_extra_recipient_limit = 5
There is no smtp_extra_recipient_limit parameter.
> these evidentially apply to the final destination, not the relay.
The rate limits apply to the next-hop destination. In order
of decreasing precedence, that is:
- the destination in main.cf:transport_maps,
- the destination in main.cf:sender_dependent_relayhost_maps,
- the destination in main.cf:default_transport,
- the destination in main.cf:sender_dependent_default_transport_maps,
- the destination in main.cf:relay_transport,
- the destination in main.cf:relayhost,
- the recipient's domain.
Wietse
