On Jul 30, 2014, at 3:36 PM, Torsten Reinert via dmarc-discuss <[email protected]> wrote:
> Starting July 26, we have seen an increase of legitimate messages being > rejected due to DMARC policy. Those numbers keep increasing daily and peak > today at 18000% of our regular values. > > Messages affected seem to be forwards by Postini to Google. IPs failing are > on the ip4:64.18.0.0/20 range (which is part of our SPF btw). Today's leading > Postini IP failing is 64.18.0.97 (PTR name: exprod5mx274.postini.com), but > all other IPs from that range stay close behind. > > Unfortunately, we do not have any message samples. The rejection happens when > Postini sends to Google. We do not have access to the email at this point. We > receive the DMARC report as policy is set on our sender domain > (r.groupon.com). But failures happen on Postini's side for what seems to be > auto-forwards. > > Google posted here: "If you have customized SPF and DKIM settings in Postini, > the transition tool doesn’t move these to Google Apps." One theory: If a > receiver, using Postini, moved to Google Apps and has customized SPF/DKIM, > the process could break. But those are just assumptions as no other > information can be found at this point. > > Does anyone here see similar behavior or can provide more insights into why > Postini's sends fail authentication to Google? What does the DMARC report say? Cheers, Steve _______________________________________________ dmarc-discuss mailing list [email protected] http://www.dmarc.org/mailman/listinfo/dmarc-discuss NOTE: Participating in this list means you agree to the DMARC Note Well terms (http://www.dmarc.org/note_well.html)
