Custom Header

Hi,
Could you please add one optional option for setting custom header to all the outgoing emails, something like this.

$mail[‘headers’] = “X-SES-CONFIGURATION-SET: XYZ”;

I am not a expert on php, but I need this to track all the emails from Amazon SES to Amazon Cloud Watch.

I guess this will be helpful for others as well.

Regards,
Saugata D.