Header adjustment based on from email?

Hi,

I’m not sure if this is possible, but I wanted to see if I can adjust the header used to send emails via Post SMTP depending on the from mail address. I wasn’t sure if there was a filter I can use or something like that. I have a specific email address ([email protected]) that I want to set to use the Broadcast stream for Postmark. By default, I’m using the Postmark transactional stream.

You can specify which stream to use by using the following:

X-PM-Message-Stream: broadcast

Is there a filter I can use to set this up? Let me know!

Thanks,
John