Jon Christopher

Sets up a REST endpoint to be used by Postmark’s Open Webhook to log opens of Postmark-delivered (via Postmark Approved) messages as Easy Digital Downloads (EDD) Customer Notes
Requires both <a href="https://wordpress.org/plugins/postmark-approved-wordpress-plugin/" rel="ugc">Postmark Approved</a> (with an accurate Server API key) and <a href="https://wordpress.org/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a> (2.6+) to be installed and active
Please see the GitHub repository: <a href="https://github.com/jchristopher/postmark-open-to-edd-customer-note" rel="nofollow ugc">https://github.com/jchristopher/postmark-open-to-edd-customer-note</a>

Postmark Open to EDD Customer Note

Easy setup

Add a Customer Note when a Postmark-delivered email has been opened by an EDD Customer

tmertz

This plugin replaces wp_mail with a custom function that utilizes PostMarkApp.com to send email to your users. 
There really isn’t much more to say about the plugin.
<h4>REQUIRED</h4>
<ul>
<li>PHP5</li>
<li>cURL for PHP5</li>
</ul>

PostMarkApp Mail Replacement

A simple plugin that replaces the default wp_mail function with PostMarkApp (http://postmarkapp.com/).

Postmark Open to EDD Customer Note vs PostMarkApp Mail Replacement