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RBL detection message

As a retail business we get a lot of emails from customers using free Yahoo/Gmail type of accounts.  Unfortunately the SMTP servers of these companies frequently find themselves being added to DNS blacklists for short periods of time.  When this happens and a customer emails us, they get an NDR back from their ISP wich reads 'Mailbox Unavailable' or something to that effect.  I realise that this NDR does not originate from your servers, but is there any way that the sender could get a more meaningful NDR?

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Hi Alan,


Thank you for the suggestion.


I have forwarded this to the Product Development team and I will keep you posted.


Regards,

Mohit.

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