Yes this one intrigued me as well, especially as one of the suggestions provided:
https://help.yahoo.com/kb/postmaster/review-practices-senders-sln3435.html Which states: If your messages are being blocked, look closely at any SMTP error codes our mail servers are returning and make sure you're addressing the problem: […] Retry 4xx messages - This is a temporary error. (sic) […] Regards, Marc > On 11 Jan 2016, at 21:27, valdis.kletni...@vt.edu wrote: > > On Mon, 11 Jan 2016 12:25:17 +0000, Marc Storck said: >> I'm looking for a Yahoo email administrator who could contact me offlist. > >> Error: "421 4.7.1 [TS03] All messages from x.x.x.x permanently deferred" > > If you find one, tell them to go look up the difference between 4xx and 5xx > return codes. :)
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