Postmark have an option trough it's API to send emails using templates created online in postmark. And then sending a series of variables instead of a text or an html body.
Is this a feature that is considered added to this module?
It would be quite handy in overriding the system created emails. And then get less hassle creating email templates.
Reference to the PHP library: https://github.com/wildbit/postmark-php/wiki/Using-Templates
Needs review
1.3
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Old issue, but still revelant. I have added support for using postmark's email templates. You need to pass 2 more vars with the $message array via hook_mail() to achieve this, with the patch applied. Content in the template is rendered with {{html}} for HTML version and {{text}} for the text version.
$message['pm_template_id'] = 'template-test';
$message['pm_template_vars'] = [];