> RFC 1035, I think it was, dating back a few years, specified that
> reverse DNS lookups were optional. Has a newer RFC made them
> mandatory?
No, but if you want to get your mail delivered, you'd better have one
on your mail sending host. Networks from AOL on down now reject mail
from no-rDNS hosts because the amount of non-spam that comes from them
is vanishingly small.
Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner
"More Wiener schnitzel, please", said Tom, revealingly.
References:
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