Date: Sat, 21 Nov 2015 15:35:54 +0000
From: David Jones <djo...@ena.com>
To: spamassassin-users <users@spamassassin.apache.org>,
Matthias Apitz <g...@unixarea.de>
Subject: Re: question re/ RDNS_NONE
Read the Received headers from the bottom up.
Thanks for the reply. I did so before sending the question to the list and
could not find any IP addr with no rDNS ...
Received: from [93.104.16.254] (helo=localhost.unixarea.de)
This IP has a lot of issues and will always hit RDNS_NONE
because there is no way
to make the FCrDNS check pass to match the SMTP HELO of
localhost.unixarea.de.
Isn't then the description of RDNS_NONE wrong when the test is not only
against rDNS, but also must match SMTP HELO?
It's also on a lot of RBLs so your outbound mail delivery is
going to be very unreliable:
http://multirbl.valli.org/lookup/93.104.16.254.html
There is not much I can do when the dynamic IP addr which the ISP gives to
me was used for spamming, bots or other bad stuff.
Research FCrDNS. It's like "caller ID" for mail servers to
prove the sender is a legit
mail server. Mail servers that talk directly to the Internet
should be on a dedicated IP
with a dedicated DNS entry so the A record and PTR records
match the SMTP HELO.
I guess you could make the FCrDNS work somewhat by setting the SMTP HELO to
ppp-93-104-16-254.dynamic.mnet-online.de. It's still on a lot of RBLs.
Thanks for the hint.
matthias
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