SCSS STYLING IN MAIL

You need to add your scss file to a package in your dependencies.ini. This can be named like anything. In our case it's "Mail". Everything added to this package will be collected together.

dependencies.ini

[dependencies] .... Mail.files[] = web/views/mails/Mail.scss

Now you need to tell the build to compile everything in this package and create the file containing all compiled data.

config.ini:

assets.packages[] = Mail

You also need to add this code snippet to your Mail.html.tpl to include the compiled package into your mail.

<style>
    <?php 
        echo Kwf_Assets_Package_Default::getInstance('Mail')->getBuildContents('text/css', 'de');
    ?>
</style>