Google requires senders to use the `List-Unsubscribe-Post` and `List-Unsubscribe` headers, which use a POST request to avoid this problem. Details: https://sup

Google requires senders to use the `List-Unsubscribe-Post` and `List-Unsubscribe` headers, which use a POST request to avoid this problem. Details: https://support.google.com/mail/answer/81126#zippy=%2Crequirements-for-sending-or-more-messages-per-day https://support.google.com/mail/answer/81126#zippy=%2Crequir... (I work for Google, but on something totally unrelated, and don't speak for them or have any inside knowledge. I was just curious and looked it up.)