New: Markdown support for outbound email

You can now send outbound email using Markdown. Set the markdown parameter when sending via the API and we'll render it to both HTML and a simplified plain text version for you.

This makes it easy to send well-formatted transactional emails without building HTML templates — just write Markdown and we'll handle the rest.

Markdown is supported in our Go and JavaScript client libraries, and in the CloudMailin MCP for sending email from AI tools like Claude and Cursor.

A blog post with more details is coming soon.