Top Web Designer and Ultratek Computers and Communications and some other organisations such as AOL, Yahoo and others require that you have a valid PTR record before they allow you to send them email.

A PTR record is a reverse lookup - it matches your domain with your IP address.

PTR lookups are required by some mail servers - otherwise you may not be able to send them email successfully. More and more email servers are enforcing PTR lookups to prevent spam.

You might think that setting up a PTR record is done by your domain registrar - after all, they point your domain to an IP address. Or you might think whoever handles your DNS would do this.

But setting up the PTR record isn't up to your DNS host, it's up to your ISP that "owns" the IP block it came from. They are the ones who need to create the PTR record.

In some cases, that MAY be the same people who handle your DNS but that it is not necessarily so.

So for example if you get your ADSL service from Jersey Telecoms, or from BT you will need to contact them.

If you don't have a PTR record, and can't get one (for example because you have a dynamic IP address), there is not much you can do if you are wanting to send mail to a host that does PTR lookups.

The only thing you can do is send / relay your outgoing email through a mail server that does.