Key dates:
| Date | Event |
|---|---|
| Oct 2023 | Google & Yahoo announce bulk sender requirements |
| Feb 2024 | Enforcement begins with temporary 421 errors |
| Apr 2024 | Google starts permanent 550 rejections |
| Jun 2024 | One-click unsubscribe deadline |
| Apr 2025 | Microsoft announces its requirements |
| May 2025 | Microsoft begins rejecting with 550 5.7.515 |
| Oct 2025 | Google retires Postmaster Tools V1, launches V2 |
| Nov 2025 | Google activates full enforcement |
The industry now calls this "Yahooglesoft" — unified enforcement across Google, Yahoo, and Microsoft.
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