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  1. I believe the server belonging to the person I am trying to email is blacklisted. Can someone confirm that for me by reading the mail delivery failure message below? If I am correct and they are blacklisted, how do I whitelist them? This is a very reputable regional theater company with whom I would like to send and receive email. Thanks for whatever help you can give me. I am flummoxed. This message was created automatically by the mail system (ecelerity). A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: (after RCPT TO): 550 host [] is blacklisted by; for whitelisting click: Arrival-Date: Thu, 22 Sep 2016 15:47:27 -0400 Reporting-MTA: dns; Last-Attempt-Date: Thu, 22 Sep 2016 15:47:27 -0400 Final-Recipient: rfc822; Status: 5.0.0 Action: failed Remote-MTA: dns; Diagnostic-Code: smtp; 550 host [] is blacklisted by; for whitelisting click: