Thanx again to the list and Aengus for the educational response.
- jim
Aengus Lawlor wrote:
>
> JBilderback wrote:
>
> > Cause of the large number of "unresolved" ?
>
> The audience for that particular site is drawn from users of an ISP that
> doesn't create DNS records for all of it's IP addresses. Some ISPs are
> worse offenders than others in this regard.
>
> For example, if you check the headers of the e-mail from this list,
> you'll notice that some of the mail is being sent to your SMTP server
> from a server with the address 64.209.164.11. Isite.net owns the block
> of IP addresses from 64.209.164.0 - 64.209.165.255, but their DNS server
> doesn't provide a name for the machine that delivers the mail.
>
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