We currently configure  the ERRBIT variables so mail can be sent out on port 25 to an internal MTA which forwards securely to our MTA provider 
Our MTA provider now has an HTTP API  endpoint to allow us to send mail via http?
My question was in regards to being able to reconfigure errbit so that it sends mail via the API endpoint... & not via SMTP/25/TCP
  
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We have a mail provider who responsible for mail routing and they