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 mock.

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.

3. Configure in settings.py

EMAIL_USE_TLS        = True
EMAIL_HOST           = 'smtp.postmarkapp.com'
EMAIL_PORT           = 587
POSTMARK_API_KEY     = 'yourkey-yourkey-yourkey-yourkey'
POSTMARK_SENDER      = 'your_company_email@domain.com'
EMAIL_HOST_USER      = POSTMARK_SENDER
DEFAULT_FROM_EMAIL   = POSTMARK_SENDER
POSTMARK_TEST_MODE   = False
POSTMARK_TRACK_OPENS = False
EMAIL_BACKEND        = 'postmark.django_backend.EmailBackend'