[Feature Request] Add Origin-MessageID header

[patriotaki]

Is your feature request related to a problem? Please describe.
Some SMTP services like sendinblue add their own headers to the email even when sending the email through phpmailer with custom messageid.
The custom message id is force-added by sendinblue in the origin-messageid header instead of the message-id
Message-Id: <[email protected]> Origin-messageId: <[email protected]>

This is an issue when you try to create a conversation thread and want to map the msgs ids.

Describe the solution you'd like
Add the origin-messageid to the headers list, it is also missing from the $email->headersRaw function