On 15/05/2023 10:21, Markus Reschke via Exim-users wrote:
Firstly I thank you for raising this on the mailing list and providing help.
I moved to a simple ACL rule to drop the connection when the
first x recipients are rejected:
drop message = Too many bad recipients
condition = ${if and
{{>{$rcpt_count}{5}}{=={$recipients_count}{0}}}{yes}{no}}
This works, however if a valid address is given (and everything else
about it is acceptable) in the first 5 then recipients_count is not zero
and condition does not trigger I have seen this attempted hack use
abuse@ and postmaster@ which according to RFCs must be valid.
I use:
condition = ${if and
{{>{$rcpt_count}{2}}{>{${eval:$rcpt_count-$recipients_count}}{2}}}{yes}{no}}
this allows only 2 bad recipients.
Note I have yet to see this hack use a valid address and not be rejected
for some other reason so $recipients_count has been zero anyway.
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