bctek
asked on
Reverse DNS Question
Hi. We have a mail server on our network:
xxx.xxx.243.231
Our domain is hosted externally at midphase.com
The NS records at the registrar point to midphase.com who has the primary name servers.
mail.ourdomain.com points to the mail server at midphase. We "POP" our mail from the midphase mail server and send our mail through our local mail server at xxx.xxx.243.231
We use our mail server to send mail, but with one recipient we got this message:
"The problem you're having getting mail to Road Runner appears to be
due to the fact that the IP address from which you're sending mail
either has no valid reverse DNS, or PTR, record, or said record is
currently unresolvable. Our inbound mail servers are now rejecting mail from IP addresses
for which the PTR record either does not exist or is unresolvable."
So my question is, how do I ensure that our mail server has reverse DNS? mail.ourdomain.com is already pointing to the right place.
What do I do to fix this? Thank you.
xxx.xxx.243.231
Our domain is hosted externally at midphase.com
The NS records at the registrar point to midphase.com who has the primary name servers.
mail.ourdomain.com points to the mail server at midphase. We "POP" our mail from the midphase mail server and send our mail through our local mail server at xxx.xxx.243.231
We use our mail server to send mail, but with one recipient we got this message:
"The problem you're having getting mail to Road Runner appears to be
due to the fact that the IP address from which you're sending mail
either has no valid reverse DNS, or PTR, record, or said record is
currently unresolvable. Our inbound mail servers are now rejecting mail from IP addresses
for which the PTR record either does not exist or is unresolvable."
So my question is, how do I ensure that our mail server has reverse DNS? mail.ourdomain.com is already pointing to the right place.
What do I do to fix this? Thank you.
ASKER CERTIFIED SOLUTION
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This is common with isps.. they dont put pointer records the way they should
ASKER
what would be the best pointer record? since mail.ourdomain.com is taken, should it say something like mail2.ourdomain.com? would that be sufficient for a reverse DNS?
Just a note here, according to www.dnsreport.com, midphase.com does have a reverse lookup for its MX record
http://www.dnsreport.com/tools/dnsreport.ch?domain=midphase.com
181.254.225.66.in-addr.arp
This resolves to a server called unknown.ord.scnet.net.
However, your MX record points to the domain midphase.com rather than a server name such as mail.midphase.com
I think you will find this is more likely your issue rather than the reverse lookup record itself.
ie the IP address resolves to one name but the reverse lookup of the IP Address returns a different name. Course I might be wrong but ....
http://www.dnsreport.com/tools/dnsreport.ch?domain=midphase.com
181.254.225.66.in-addr.arp
This resolves to a server called unknown.ord.scnet.net.
However, your MX record points to the domain midphase.com rather than a server name such as mail.midphase.com
I think you will find this is more likely your issue rather than the reverse lookup record itself.
ie the IP address resolves to one name but the reverse lookup of the IP Address returns a different name. Course I might be wrong but ....
smtp.mydomain.com for the mail server that sends out mail would be a good one.
Chris
Chris
ASKER
thanks. that solved it.
Awesome :)