Is there a way to modify how the html fields are outputted by Redactor? I'm creating an email template and I'm trying to add inline styles to Redactor's list items, links, etc.
Craft uses the redactor js plugin. You can change it's settings, plugins and all formats like you want in the config
craft/config/redactor or add custom presets. Here is the link how to configure the redactor https://imperavi.com/redactor/docs/settings/formatting/