Friday, May 17, 2002 you wrote:
RSP> I have never, ever seen a mailserver do this (although I believe
RSP> Len has). Mailservers that reject the mail based on the HELO not
RSP> matching the reverse DNS entry are violating the RFCs, and will
RSP> drop HUGE amounts of legitimate mail.
I have seen this two or three times perhaps. In every case it was a
mail server belonging to a college. The last case I encountered
was very interesting because in my IMAIL logs I had the rejection
response something along:
mail from domain.com ...
rejected mail not from domain.com.
NOTICE the "." dot on the end of the rejected line. I'm not
sure what they were doing but somehow they were appending a "."
dot to the reverse.
I finally was able to show them what was happening through a
message from a HOTMAIL account which apparently was being passed
on above the rejection.
They corrected the problem.
RSP> No. There's no need to give in to those people. There's no reason
RSP> to have a reverse DNS entry of mail.example.com if the mailserver
RSP> says HELO mail.other_domain.com (except to please the very, very
RSP> small percent of mailservers that do that, knowing they will not
RSP> get a lot of their legitimate mail).
Yeah, if you don't help them correct this they will lose lots of
mail.
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