On 1 Jun 2016, at 10:10, Robert Chalmers wrote:
This is the body of a series of similar messages I’ve been getting -
very obviously spam. Very rude.
However - I’m struggling now to find why postfix and or postscreen
etc is letting it through, when it obviously fails a lot of tests.
My postconf - n follows this email extract.
If anyone has any ideas, I’d love to know.
[...]
Received: from cpanel.intertainmentmedia.com (unknown
[64.34.190.110])
by zeus.chalmers.com.au (Postfix) with ESMTPS id 0CE863489B14
for <rob...@chalmers.com.au>; Tue, 31 May 2016 22:36:47 +0100 (BST)
If you had reject_unknown_reverse_client_hostname in
smtpd_recipient_restrictions or smtpd_client_restrictions this would
have been rejected without bothering Amavis & SpamAssassin.
That restriction is very low-risk, as it requires an explicit negative
reply to a PTR query to permanently reject a message. If it gets a DNS
timeout or SERVFAIL (i.e. a failure to resolve a name that may exist)
the client gets a 450 reply, so legitimate clients will retry later.
