Yes Dan, the "proper" fix is to fix the rDNS record.
What we're talking about here though is some other sender's rDNS, which
we have no control over. It would be appropriate to contact the tech
contact for the sender's domain to inform them that their rDNS needs
fixing. In the meantime, whitelisting the rDNS value that the do have
(however errant it may be) would allow mail to flow while the rDNS is
being fixed.
Correct?
Thanks.
--
-Eric 'shubes'
On 09/19/2013 11:39 AM, Dan McAllister wrote:
A "proper" RDNS entry is a hostname.
Some ISPs insert "dummy" RDNS entries.... like
a-b-c-d.provider.location.com. Actually, "some" should probably be
"most" ISPs.
Because these are "generic" PTR records, they are treated as "no PTR"
values by anti-SPAM settings.
The correct fix is therefore not white-listing - it is setting a proper
PTR record -- usually SOMETHING that resolves in the other direction
back to that same IP address.
E.g.:
mail.qmailtoaster.com. IN A 1.2.3.4
4.3.2.1-inaddr.arpa. IN PTR mail.qmailtoaster.com.
Dan McAllister
IT4SOHO
QMT DNS/Mirror Admin
On 9/19/2013 9:08 AM, Eric Shubert wrote:
On 09/19/2013 02:10 AM, Linux wrote:
Hi All,
When my client try to send a mail to me, he received the error message,
as follows,
*MYMAILID.MYDOMAIN.in*
*mail.MYDOMAIN.in #554 Refused. Your reverse DNS entry contains your IP
address and a country code. ##***
Will it solved when I put clients domain name in whitelist senders.
Regards,
Vivek Patil
system admin
You genenerally don't want to whitelist senders. They're very easy to
forge.
You can either comment out the "reject-ip-in-cc-rdns" rule, or perhaps
whitelist the rdns name. Personally, I would whitelist the rdns name.
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