EMAIL HEADERS
Delivery options
EMAIL CONTENT
Cleanup options
Use {{name}} placeholders for mail merge, and {{name|there}} for a fallback when the value is empty.
Clients that block HTML, smartwatches and spam filters read this part. Sending HTML without it scores worse with spam filters.
ATTACHMENTS
PREVIEW
Forced dark mode imitates clients that invert colors (Outlook.com, Gmail app on some phones). It is an approximation.