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

I am using below code and works fine, just convert the hash to json with to_json

headers['X-SMTPAPI'] = { 
  category: "Weekly Newsletter",
  unique_args: { user_id: user.id } 
}.to_json