Posts Tagged ‘rfc1918’

Google Mail Fail

Found an interesting header when doing some tests with mail filtering: Received: from qb-out-1314.google.com ([172.21.30.5]) by mx.google.com with ESMTP id k29si2692710qba.7.2008.09.06.14.48.05; Sat, 06 Sep 2008 14:48:06 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning user@example.com does not designate 172.21.30.5 as permitted sender) client-ip=172.21.30.5; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning user@example.com does not designate 172.21.30.5 […]