Sometimes I get messages with this type of header? I'm surprised it
doesn't already get blocked by what I have in place, but somehow they
get through.
Received: from unknown (HELO ?10.88.0.4?) (34.53.228.165)
Is there something I can put in blacklist_senders to catch these? Or
some other way to block them?
Looks like they come from a private address behind a firewall with a nat
to a public address, typically from an ip based rdns entry indicating
it's some server probably at someone's house. I can block those by
enabling reject-ip-in-cc-rdns, but there seems like there should be a
way to block these based on the header. I haven't implemented ip rdns
blocking yet, I'm not sure why as pretty much any legit email server
should have a proper rdns of some sort. Or at least I think they should.
Thanks
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Gary Bowling
The Moderns album NEXT on your favorite streaming platform
<https://distrokid.com/hyperfollow/themoderns/next>
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