How to create custom email headers

Question

I\'m trying to create a custom email header to use the SendGrid api.

Here\'s what I\'m doing - but its not working:

class Mailman < ActionMailer::Ba         


        

Answer 1

The headers method requires valid JSON. So Ricardo's solution requires this line instead:

headers['X-SMTPAPI'] = '{"category": "Drip Email"}'