On 05/07/2013 02:02 PM, Vincent Lefevre wrote:
[snip]
A PTR is not associated with a host, but with an IP address. That's
important because mail may be sent from different IP addresses,
depending on the recipient or other factors. And it seems that
some users forget to set up a PTR for all their IPv6 addresses.
This apparently includes Debian's mailing-list server.
It does not matter who sends the email. The sending MTA host should have
a proper PTR (yes for the IP address). Forgetting to set a PTR is not an
excuse. Would you accept it if a gas station forgot to label their fuel
properly causing possible damage to your car's engine? If Debian's
mailing-list server does not have a PTR set then they should fix that.
You can probably file a bug somewhere or poke some Debian infra person
on irc. And if they are not totally clueless then their mail admin
should see a bunch of bounces in their logs due to the absence of a PTR
which hopefully rings a bell.
and you can ignore this but you also need to understand the the
rules from which machines i and many others accept mail are not up
to you
I agree, but I repeat that I cannot change the config of other
users. From what I can see in my mail archive, it is *not* safe
to blindly reject mail from IPs without a valid PTR. At least
currently.
So you basically accept that a mail admin of another system is clueless
or lazy? Please don't let them get away with that, even if it could be
legitimate email. They should do a proper job. For years it has been
working great for my domains. Up to a point where the relation between
spam attempts and legitimate email is more than 100:1 and yet at best 1
or 2 spam emails get through per week which are then grabbed by other
anti-spam measures (spamhaus, dspam). It's up to you but all this time I
have had so little trouble from it that I strongly recommend it.
Together with Stan's dynamic host list it should reject a ton of spam
attempts.
Regards,
Patrick
