Le 21/10/2025 à 09:44, Viktor Dukhovni via Postfix-users a écrit :
On Tue, Oct 21, 2025 at 08:52:23AM +0200, Antonin Verrier via Postfix-users
wrote:
Is there any way to reject mails from domains with useless MX records?
I assume you mean to say that *ALL* the MX records would have to be
"useless"
Actually, I didn't think it this far since the wave of crap I've been
dealing with comes from domains that only have one single MX record,
which is "useless".
I want to reject cases where the MX records themselves are syntactically
valid, but the name they point to doesn't have any A or AAAA records.
I am sceptical that this is a particularly effective way to stop
unwanted email.
You're right, as a general purpose solution, it is probably not very
"cost-effective".
I was wondering why reject_unknown_sender_domain didn't already
implement those checks, but now with your explanations it makes sense.
And writing a policy service specifically for this use case seems a bit
overkill, since those messages do end up being filtered by an antispam
milter based on their content.
Thank you.
Antonin
_______________________________________________
Postfix-users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
