There are email plug ins that allow you to send email that is not the plain text version that Native FileMaker supports.
There are many options for controlling the content of the email body with calculations that structure it's content the way you need. You can create a simple list or small table of values from the database as part of the plain text in the email, for example.
You can also attach files automatically to your emails in scripts if you want. These emails can be PDF's of FileMaker reports that you generate from the same script if you want.