Reverse dns (rdns)

[Ryan Bounds]

We are moving our email server from our current ip to a new external ip and
we have heard from other groups that we need to set up a reverse dns.
Please could anyone confirm this query and give some info on the setup
process.
We have already moved the email server to the new ip but within 24hours we
were getting messages returned to the server with the text:
The SMTP server rejected the message 'RE: Subject' due to an incorrect From:
field. The reply given by the service provider was '550
<*******@*****.co.uk>... Not permitted......so we have now moved it back to
it's original ip.
We have also contacted our isp, which is BT Connect but they have ssid that
they cant help us with this.

Any help would be thanked.

RR

 

[John Coutts]

We are moving our email server from our current ip to a new external ip and
we have heard from other groups that we need to set up a reverse dns.
Please could anyone confirm this query and give some info on the setup
process.
We have already moved the email server to the new ip but within 24hours we
were getting messages returned to the server with the text:
The SMTP server rejected the message 'RE: Subject' due to an incorrect From:
field. The reply given by the service provider was '550
<*******@*****.co.uk>... Not permitted......so we have now moved it back to
it's original ip.
We have also contacted our isp, which is BT Connect but they have ssid that
they cant help us with this.

Any help would be thanked.

RR

************** REPLY SEPARATER **************
Generally speaking, reverse lookup is provided by your upstream provider. Many
mail servers check to see that the source server has a PTR record, and some
will check to see that there is a corresponding "A" record. Because reverse
lookup is top down driven, many ISP's are reluctant to pass on the authority
for anything less than a "C" class network. Contact your upstream provider, and
they are unwilling to help you, then you may have no choice but to change
providers.

J.A. Coutts