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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 ...


This header Received: from hello3.much.cheap ([2607:5300:60:6516::]) by mx.google.com with ESMTP id f2si9741219vdb.2.2015. 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 ...


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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