1. Install module of Python Postmark
Install this module manually from souce inside your environtment: https://github.com/themartorana/python-postmark
If you work on
Django==1.9.*, requirements only
2. Register and Put the Server Keys
Register and put your server API token here: https://account.postmarkapp.com/servers/101010/credentials .
101010 is id of your server.
Makesure verified your SPF and DKIM. this configurations to allowing the permission from your domain for signature.