See the new email authentication standards being implemented by Google and Yahoo from 1 Feb 2024, with other platforms sure to follow after.
https://blog.google/products/gmail/gmail-security-authentication-spam-protection/#:~:text=for%20large%20senders.-,New%20requirements%20for%20bulk%20senders,rely%20on%20an%20email's%20source
Please allow for single-click unsubscribe option within the platform.
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