hoping someone could help me out. I'm sending out SMTP email with a custom header, e.g x-commId and for a successful email, this header is shown in the received message header (Which is not when I actually need it).
When I send this to an invalid address, the failed response strips out this header (exchange didn't do this). I need this commId to initiate a fallback and disable the email address (via automation). Does anyone have any thought how I could get around this problem of the header going missing.