error 550

error 550

hi
I have a problem
I can't send to some emails

This is the error i get:

This message was created automatically by mail delivery software.

 A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

 

, ERROR CODE :550 - DKIM: encountered the following problem validating tasnimpharma.com:

                                                pubkey_unavailable




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