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 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 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 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>
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