Matt wrote:
I had the same issue and found that the system that's relaying
(216.129.105.40) those confirmation emails doesn't have a PTR record.
You'd think someone selling a antispam/email appliance would be familiar
with the RFCs.
That would explain why I got no confirmation, we do not accept email
from IP's without a PTR record.
I agree, if true this looks pretty bad for a so called antispam
company.
In fairness -- if you drop mail with no rDNS, you are dropping 3.6% of
legit email in general, going by the test results for our RDNS_NONE
rule... ;)
Everyone should block/defer ALL email with no reverse DNS. Then maybe
those email admins would get a clue.
when you say "they", you mean who? there are N new domains every day.
you think rejecting mail will affect the domains that will be created
tomorrow?
If everybody blocks such mail, then I'd say let's do it. but I don't
want to get an "everybody but you accepts our mail".
besides, this FcrDNS thing can hardly be applied to IPv6, which is
apparently the future...
or to say it in another way: yes, there is a problem, but the solution
is not in DNS.
