Hartshorn, Joel wrote:
> Per my 550 Can't relay issue, it appears that I may have found something.
> 
> When I do an nslookup on the IP it does not resolve, so I am assuming that
> my ISP doesn't have the IP address in reverse DNS.
> 
> Does that sound right?

Even if your ISP has it in their DNS tables if they're not the owner
and the owner hasn't delegated it to your ISP a in-addr.arpa lookup
could fail.

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