Gmail dumps patch review email in my junk box. The problem seems to be the spoofed From: header.
Received: from psf.upfronthosting.co.za ([2a01:4f8:131:2480::3]) by mx.google.com with ESMTP id m1si26039166wjy.52.2015.05.12.00.20.38 for firstname.lastname@example.org; Tue, 12 May 2015 00:20:38 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning email@example.com does not designate 2a01:4f8:131:2480::3 as permitted sender) client-ip=2a01:4f8:131:2480::3;
Tracker reviews are the only false positives in my junk list. Otherwise, I might stop reviewing. Verizon does not even deliver mail that fails its junk test, so I would not be surprised if there are people who simply do not get emailed reviews.
Tracker posts are sent from Person Name firstname.lastname@example.org Perhaps reviews could come 'from' Person Name email@example.com
Even direct tracker posts just get a neutral score. Received-SPF: neutral (google.com: 2a01:4f8:131:2480::3 is neither permitted nor denied by best guess record for domain of firstname.lastname@example.org) client-ip=2a01:4f8:131:2480::3;
SPF is Sender Policy Framework https://en.wikipedia.org/wiki/Sender_Policy_Framework
Checkins mail, for instance, gets an SPF 'pass' because python.org designates mail.python.org as a permitted sender.