Starting November 2025, Gmail is ramping up its enforcement of email sender requirements, and non-compliant emails may face delays or rejections.

https://support.google.com/a/answer/14229414?hl=en

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Email sender guidelines FAQ - Google Workspace Admin Help

Important: Starting February 2024, Gmail requires the following for senders who send 5,000 or more messages a day to Gmail accounts: Authenticate outgoing email, avoid sending unwanted or unsolicit