There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

hperrin ,

This might help too:

support.google.com/a/answer/81126?hl=en

There’s a “Requirements for all senders” that’s got a note:

Starting February 1, 2024, all senders who send email to Gmail accounts must meet the requirements in this section.

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