On Thu, May 18, 2023 at 07:48:32PM +0800, Tom Reed via Postfix-users wrote:
> If a sender write a message which has N recipients in the same
> destination domain (say gmx.de), when postfix deliver this message to
> peer MTA, will it deliver one copy, or N copies?
For a typical message the number of deliveries to a given domain is
floor( #recipients / <recipient_limit> )
where <recipient_limit is either:
$<transport>_destination_recipient_limit
or else (if the former is not defined):
$default_destination_recipient_limit
The latter defaults to 50. Under much less common conditions, for
messages with many thousands of recipients, the less-popular
destinations may be under-represented in each batch of recipients read
by the queue manager, resulting in fewer recipients than the limit in
each delivery, despite presence of additional recipients in later
batches.
--
Viktor.
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