In 2018, plain text email is obsolete from a marketing perspective. However, plain text can still provide value to senders and inbox providers by allowing marketers to include easily scanned and filtered content. Include so a computer will score your email as higher quality content, not because it's an important marketing channel.
To Add Plain Text:
- Select "view" from your template list
- Click "Add Text"
To View Your Plain Text:
- Send a test email to yourself
- Look for "view source" or "view original"
- Search for "Content-type: text/plain" inside the email html