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Spamcop is analyzing mail headers and fails to recognize a legitimate mail host at Rackspace. The host is: smtp4.gate.iad3a.rsapps.net I went though the mailhost list on my mailhosts tab and it doesn't appear. Here is a snip from the analysis: 3: Received: from [18.104.22.168] ([22.214.171.124:54407] helo=cavuit01.kulnet.kuleuven.be) by smtp4.gate.iad3a.rsapps.net (envelope-from <x>) (ecelerity 126.96.36.199 r(42060/42061)) with ESMTP id 0F/73-03583-136B9755; Thu, 11 Jun 2015 12:24:17 -0400 Hostname verified: rhcavuit01.kulnet.kuleuven.be Possible forgery. Supposed receiving system not associated with any of your mailhosts Will not trust this Received line.