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Loop for SMTP Reverse Banner Check DNS Resolution

Common errors:

 Loop detected! We were referred back to

 Too many delegations to other servers. Probably a loop.



 Verify that your reverse DNS is setup properly.

 Verify that your IP provider has given you full IP delegation. (in some instances you need to specify that you want full reverse delegation as some providers will still route through their own DNS first causing errors for some reverse DNS methods.)



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