This plugin requires Craft CMS 3.0.0-beta.1 or later.
To install the plugin, follow these instructions.
Open your terminal and go to your Craft project:
Then tell Composer to load the plugin:
composer require flipboxdigital/postmark
In the Control Panel, go to Settings → Plugins and click the “Install” button for Postmark.
Once Postmark is installed, go to Settings → Email, and change the “Transport Type” setting to “Postmark”. Enter your server Postmark API Key (which you can get from your server page) and click Credentials.