If you want to check out some ones e-mailer try using this:

Go to www.dnsstuff.com

You should find a page full of red and blue boxes.  At the top of the  
middle column there is a box called Spam Database Lookup.
Enter the IP address you wish to check ( 80.6.xxx.xxx) then click on  
"Look Up" in the little box to the right.

That is my IP number in there, try one that has a fault.
You will jump to another page which will have an all white background  
if everything is OK, in my case, I think, it said I was successful  
with 263 servers.

If there is something wrong, the top Line will have a red background  
and it will have the IP number you wish to check.  The result column  
will give you some indication of what is wrong.
In the address I checked it told me that that the IP had no DNS  
reverse entry.
I don't know what that means, but I have passed the info. on.

I thought you might find this useful sometime.

John taylor
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