Custom SMTP Message Headers
Sep 30, 2019 7:49 PM
Is there any way we can set custom smtp headers in a single send / transactional api call?
For instance I am trying to send in a X-CustomHeader into the Email Message Headers. To clarify, I am not talking about the html header/footer, I am referring to Headers you can analyze via MHA in Outlook.
I have researched this in the api documentation, but cannot find an answer.
I have also tried amending fields into the json request to test, but have not had success.
"emailId": 1250459XXXX ,
"x-custom1" : "test1",
"x-customHeader2" : 'Test321'