Ok, so I switched the image root path from
define('SUBSCRIBE_USER_BASE_DIR', dirname(__FILE__));
to
define('SUBSCRIBE_USER_BASE_URL',plugin_dir_url(__FILE__)); and this worked.
dirname(__FILE__) registers:
<img src="https://wordpress.stackexchange.com/var/www/html/internal/wp-content/plugins/AV_-_Subscribe_User/email/email_header.png"
Whereas the latter plugin_dir_url(__FILE__) outputs:
<img src="http://mysite.com/wp-content/plugins/AV_-_Subscribe_User/email/email_header.png"
I’m not 100% clear as to when to use which but I’m guessing that I would use dirname when I am operating within the site server.
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