Gmail API is overwriting the custom Message-ID header while sending emails
问题 We are using the Gmail API to send emails on behalf of the users of our App. On the header of the emails we send via the Gmail API, we are setting a custom Message-ID. Nevertheless Gmail is overwriting the Message-ID we set with a different one . The following are some Message-IDs that we have tried: <8368110f-6ffc-46f8-8e67-7ebf0e1a1d83@domain> <4fb7a8b7013099c524f70906e009b46218461fff0b2dc0f8b794eb2df26e93d7@domain> Any idea why this ID overwriting is happening ? I would really appreciate