I hope everyone is having a great day today. I am writing for assistance with sending to yahoo, AOL, Verizon, etc. email servers. Around Sept/Oct of 2019 we started seeing some of our emails get deferred for about 4 hours or so to yahoo and company servers. We have implemented DKIM/Dmarc and Yahoo feedback loop. Since then we have had 3 emails come to us from that program. We immediately blocked outbound emails to these email address. However, we continue to have issues. Well, this past Monday, we noticed that we can no longer send to yahoo servers. However, the error messages are still the same.
Yahoo error message: Deferred: host mta6.am0.yahoodns.net[67.195.204.77] said: 421 4.7.0 [TSS04] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command) I am not sure what to do. We have tried several times to contact yahoo postmaster and it always comes back with links to their best practices. We are a nonprofit religious group and a school district. We often communicate with parents and volunteers who have yahoo accounts. Any assistance is greatly appreciated. Stephen Brown Diocese of San Bernardino
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