Re: [Fail2ban-users] Drop Established Connection on Ban

[Peter H. <mai...@ma...>]

Am 03.05.2021 um 16:47 schrieb Kenneth Porter:
>  I haven't found anything on rate-limiting it except as an anti-spam 
> measure.
>

However, sendmail runs milter. They made for sendmail native.

There is milter-greylist, which have "rcptcount".

You can cause a abort after a number of RCPT TO: from milter with a 4xx 
errorcode, so the sending MTA comes back with a new connection.

regards Peter