> On Dec 6, 2018, at 2:19 PM, Andrey Repin <anrdae...@yandex.ru> wrote:
>
> In other words, if I have multiple different messages to the same destination,
> I can't know if they will be delivered through single connection?
> And can't control it?
If the inter-message spacing exceeds the either of:
http://www.postfix.org/postconf.5.html#connection_cache_ttl_limit
http://www.postfix.org/postconf.5.html#smtp_connection_cache_time_limit
then any cached connections would be closed before it is time to send
another message. Generally, with serialized deliveries, you should not
cache connections. Keeping idle connections open is anti-social, you're
consuming remote resources.
A transport with a destination rate delay will not do demand caching,
which IIRC requires either concurrent or closely spaced deliveries
before it is enabled.
Bottom line, with rate delays, each delivery would be expected to use a new
connection. On demand connection re-use is not compatible with rate delays.
--
Viktor.
