> On Dec 14, 2017, at 1:41 PM, Emanuel <[email protected]> wrote:
>
> I want to limit the number of recipients that can be sent from a certain
> IP address. (outgoing email).
The outgoing recipient limit is configured per-transport via
<transportname>_destination_recipient_limit.
main.cf:
default_destination_recipient_limit = 50
smtp_destination_recipient_limit = 50
relay_destination_recipient_limit = 50
...
These settings apply to the qmgr(8) process. Note that RFC5321
does not require a receiving SMTP server to accept more than 100
recipients per transaction. And many (too large to bother with
the RFCs) receiving systems choose to violate the RFC and enforce
lower limits.
Therefore, limits of more than 100 recipients per outgoing SMTP
delivery are unwise except to specifically selected peers known
to tolerate the higher limits.
--
Viktor.
