553 invalid sender

D

Dayne

sending to certain addresses from certain users gives the
following information. Some users can send to the
address and some can't.

"Unable to deliver the message due to a communications
failure. The MTS-ID of the original message is: etc etc
etc 553 Invalid Sender"

Obviously the etc etc etc is not the real information.

Anyone know what the problem is and/or how to fix it?
 

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