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You need to add opendkim as a milter to postfix. Make sure these two lines are in postfix's main.cf: milter_protocol = 2 milter_default_action = accept Then add opendkim to your milters: smtpd_milters = inet:localhost:8891 non_smtpd_milters = inet:localhost:8891 I would also add localhost to the TrustedHosts file for opendkim since it's possible that ...


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This header Received: from hello3.much.cheap ([2607:5300:60:6516::]) by mx.google.com with ESMTP id f2si9741219vdb.2.2015.06.05.19.26.14 for <XX@XXXX.com>; Fri, 05 Jun 2015 19:26:15 -0700 (PDT) is indicating that postfix send email to mx.google.com via IPv6. In other case, postfix will send email via IPv4. SPF checker ...


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It could be related to the DNS precedence rules. The standard is solve first IPv6 and then IPv4. You can change this behavior changing the file /etc/gai.conf If you want to give priority to IPv4, uncomment the line that says: #precedence ::ffff:0:0/96 100



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