Eric Katherman wrote:
> 
> Can somebody explain why some mail servers will kick a message back with
> the "Sender Must Resolve" error but other servers (which I know for sure
> in the past have done the same thing) accept the message.  The server
> that is listed as the origin is in both of my dns servers.  Just
> wondering if somebody has had this problem before.
> 
> Thanks
> 
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Check the reverse ARPA tables.  Does the IP resolve to a name?  Been
there . . . 

George