I working with an application which collects data and emails me the
results.  Reading it in a mailinglist-like fashion is optimal for me.

It can generate a large number of mails in a short time, so I'm trying
to limit how many concurrent sockets pf on that box opens with my MXs.

Each subset of messages has a different +extension in the localpart.

Ideally, I'd like it to open one to each of the equal-priority MXs,
starttls with each, and dump the mails between them until the queue
drains.

I tried setting:

  smtp_destination_concurrency_limit = 2
  smtp_connection_cache_destinations = jhcloos.com

but still get as many Verified TLS connection established messages in
the logs as status=sent lines.

And netstat agrees that many sockets are used in parallel.

Do any of:

  smtp_dns_support_level=dnssec
  smtp_use_tls=yes
  smtp_enforce_tls=yes
  smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
  smtp_tls_security_level = dane
  smtp_tls_note_starttls_offer = yes

interfere with concurrency limits?

That box has pf 2.11.1.

-JimC
-- 
James Cloos <cl...@jhcloos.com>         OpenPGP: 0x997A9F17ED7DAEA6

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