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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: CaitlinU@pcs.org (after RCPT TO): 550 host [18.104.22.168] is blacklisted by bl.spamcop.net; for whitelisting click: http://dmx.pcs.org:3000/?click=00e3b1d963a50b9f9ab73c301db12fafb1cce5cc5b889f8d84bb600534a2cb6b3ef9a5cdd030bf3f096798df31998a41ecf5c90673fb29d8624cf114b9a03431 Arrival-Date: Thu, 22 Sep 2016 15:47:27 -0400 Reporting-MTA: dns; smtp.q.com Last-Attempt-Date: Thu, 22 Sep 2016 15:47:27 -0400 Final-Recipient: rfc822; CaitlinU@pcs.org Status: 5.0.0 Action: failed Remote-MTA: dns; mail.pcs.org Diagnostic-Code: smtp; 550 host [22.214.171.124] is blacklisted by bl.spamcop.net; for whitelisting click: http://dmx.pcs.org:3000/?click=00e3b1d963a50b9f9ab73c301db12fafb1cce5cc5b889f8d84bb600534a2cb6b3ef9a5cdd030bf3f096798df31998a41ecf5c90673fb29d8624cf114b9a03431