REVERSE DNS LOOKUP - Exchange 5.5

[DarraghFitzpatrick]

Users of my mail server are having problems sending to and receiving from certain domains. They are receiving NDR's stating "Unable to deliver the message due to a communications failure", also "550 sender not verified"

I believe the issue is being caused by a reverse DNS issue.

The ISP that manages my domain does not support Reverse DNS Lookups.

Does anybody know if I can configure Exchange 5.5 to mask the fact that my ISP does not support this and therfore manage to be able to send email to these domains ?

If not, should I not be abloe to contact the companies whose domains I cannot email currently and have them add my domain to an acceptable list ?

Any help would be appreciated

Darragh

 

[zbnet]

Get another ISP -

http://www.swinc.com/resource/exch_smtp.htm

has info on what you can and can't set up in IMS, and a list of recommended ISPs.

 

[dmcse]

Just a note to add.

I had a similar problem, but it was due to an underscore in the name of my Exchange server, which is not regognized by Internet code. Hope this is not your problem too.

DM