Hi, Thore,
Sorry for not getting back to you sooner.
How can I override those colors?
Since the plugin v2.7.1, you can set additional styling with the new “Email style” options (in “WooCommerce > Settings > Emails > Custom email #X > Email Data”).
Or can I use a filter / hook to add custom styling to my email?
Yes, you can use the alg_wc_custom_emails_content
filter:
add_filter( 'alg_wc_custom_emails_content', function ( $content, $email, $order, $user, $product ) {
if ( 1 == $email->alg_wc_ce_id ) { // for the "Custom email #1"
$content = '<style> .my-class { color: orange; } </style>' . $content;
}
return $content;
}, 10, 5 );
Please give it a try and let me know what you think.