Some Emails are rejected by Destination servers 1

[amigo02]

We have a Windows Small Business Server 2003 and have a static IP with verizon DSL.

We also have an ISP called fatcow.com which is hosting our web site and forwarding the MX record to this static IP

Now with all that said,

I get a return message as follows with some of the emails that I send;

The following recipient(s) could not be reached:

someEmail@someDomain.com on 10/29/2004 11:49 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

<myDomain.com #5.5.0 smtp;550 rejected because of RBL:

http://dsbl.org/listing?ip=myIPAddress>

I know it is a reverse DNS issue but what I don't know is how to resolve it?

 

[fs483]

Contact your ISP and have them create a reverse DNS from your mailserver IP to your domain. To check if it's active, go to

http://www.dnsstuff.com

and choose the test in the second column, second one. After you enter your IP and click on RevDNS, you should see in the section

Answer :
your.public.ip PTR Record: your.mx.record. [TTL xxxxx] .

One of my customer had a problem with both Rev DNS and the fact that the IP USED to be part of a dynamic IP block therefor being blacklisted.