As a server administrator with over 15 years of experience, I've consistently sent emails from my server to various accounts without issue—until recently. Now, attempts to send emails to my Yahoo account result in a bounce-back with error code 451. Conversely, when sending from Yahoo, it indicates that my server email does not exist, despite it being active. I've tested other domain emails and encountered no problems. It seems there have been significant disruptions, particularly around late December 2025. I strongly advise against using their services.
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