[Fixed]-Django EmailMessage reply_to object not passing through to headers

Your code looks ok – using reply_to=['helpme@helpme.com'] should work in Django 1.8+.

It looks like you’ve hit this bug in sendgrid-django. You could try applying the fix in pull request 51 (it only supports a single reply-to address but in your case that looks ok), or you could switch to another service to send your emails.