Am 28.05.23 um 04:04 schrieb AC via Exim-users:
> I was searching through the lists and reading the documentation but
> I'm coming up short on blocking IP only senders.
>
> I've seen ACLs checking sender_helo_name using isip{} but that doesn't
> seem to do anything for the case of a literal IP:
>
> H=([185.17.76.25])
>
> What's the proper way to check for the above condition and reject it?
>
Simple:
drop message = invalid NON-FQDN HELO ($sender_helo_name),
please talk to your mailserveradmin about this
condition = ${if
match{$sender_helo_name}{\N^\[[0-9]+.*\N}{0}{1}} <- unchecked regex,
may need adjustment
condition = ${if match{$sender_helo_name}{\N(\.|:)\N}{0}{1}}
... add more rules to your needs...
you should add a rule, which skips, if the sender host is it's own
localhost via smtp.
Looks like this in the logs:
2023-05-28 09:36:46 H=(localhost) [117.7.227.162] rejected MAIL
<hqih8fu3v6mc@???>: invalid NON-FQDN HELO (localhost),
please talk to your mailserveradmin about this
best regards,
Marius
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