alex at ergens
Jan 16, 2007, 3:42 PM
Views: 822
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On Tue, Jan 16, 2007 at 05:15:09PM -0600, Steve Yates wrote:
> In most situations I've run across if the receiver detects the sending
> IP doesn't have a reverse DNS record, they may reject the message...it
> doesn't matter what the reverse DNS *is*, they just want it to exist.
Sure, I understand that part.
But besides the SPF "ptr" mechanism, I know there are other situations
where it does make a difference.
Just one example:
http://www.postfix.org/uce.html#reject_unknown_client
As I said before, I have reasons to believe something similar is
used in scoring systems (e.g. wrong configuration results in 0.1,
and at 5.0 you're out).
If I may paraphrase:
your "It doesn't matter."
vs. my
"Often the other end does not pay attention to it but there are cases
where doing it right does matter."
> It would be ideal to have the forward and reverse DNS match, but many
> ISPs just set up dummy names like ip-__-__-__-__.something.example.net.
Yes. Why encourage them by saying it doesn't matter ? I agree they
do so, but that does not make it OK (... irrelevant ...).
I won't object when you say it usually doesn't hurt. But don't say
it is OK to do it like this, and do make clear that this does not
cover 100% of all cases.
When you say it is irrelevant, there's yet another soul on this earth
who is misinformed. He may help his peers/neighbours/office, they
also spread the news and before you know it another generation of
click-and-drool types is born.
People remember your statement, and don't RTFM. Before you know it
there's that "but Steve said ..." argument.
HTH
Alex
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OT: SPF syntax correct?