Hi Alexander, MailChimp had been seeing this issue as well across our IPs. It was happening with all domains that use Yahoo’s mail infrastructure (AOL, Verizon, etc). We reached out to Yahoo and they got it fixed up on their end. Your milage may vary of course, but if what you’re seeing is related to what we were seeing reaching out to Yahoo is the best bet.
Thanks, Matt Gilbert -- Deliverability Engineer | MailChimp delivery.mailchimp.com > On Aug 10, 2018, at 4:12 PM, Alexander Burch <abu...@activecampaign.com> > wrote: > > We've seen a big uptick in Yahoo throttling in the past 7-10 days with this > typical message: > > 421 4.7.0 [TSS04] Messages from XX.XX.XX.XX temporarily deferred due to user > complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html > <https://help.yahoo.com/kb/postmaster/SLN3434.html> > > This seems to be happening fairly indiscriminately across various IPs, and I > know for certain none of them have high complaint rates. > > Yahoo's postmaster page says "The error is temporary. We encourage you to > retry sending emails 4 hours after encountering the error." > https://help.yahoo.com/kb/postmaster/SLN3434.html > <https://help.yahoo.com/kb/postmaster/SLN3434.html> > > We have backoffs at Yahoo, but they certainly don't last for 4 hours. Should > that be taken literally? If we see that error should we backoff sending on > that IP for 4 hours? That seems a bit extreme. Can anyone offer perspective > on the backoff intervals they use here? > > Thanks, > Alex > > > -- > > > Alexander Burch > ActiveCampaign / Deliverability Engineer > abu...@activecampaign.com <mailto:abu...@activecampaign.com> > 1 North Dearborn St Suite 500, Chicago IL, 60602 > <https://www.facebook.com/activecampaign> > <http://www.twitter.com/activecampaign> > <https://www.linkedin.com/company/activecampaign-inc-> > <https://plus.google.com/107063868317743606466> > <https://www.activecampaign.com/sig/?u=aburch&c=1> > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
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