As is mentioned in this post on the Laravel News site one of the improvements coming in Laravel v5.4 will be the ability to use Markdown formatting in your emails.

Laravel 5.3 introduced two new features around email, the Mailables and Notifications which allow you to send the same message through email, SMS, and other channels.

Building on top of these improvements, Laravel 5.4 is going to include a brand new Markdown system for creating email templates.

Under the hood, this feature implements the Parsedown parser with its companion, Markdown Extra so you can use tables.

They go on to describe how this feature is integrated with the "components and slots" handling also recently introduced in the framework for things like headers, messages, layouts and tables. Also included is some example code showing how to return the Markdown parsed version of a view, using them in notifications and how to use inline styling.