Awesome

Markdown to multipart MIME

Answering the age-old debate: HTML or plaintext emails? Both!

Write email in markdown, and convert to multipart MIME that works impeccably in graphical and console mail clients.

Creates a conservative ISO/IEC 15445:2000 HTML representation, which is set as the preferred multipart alternative for graphical clients.
The text alternative is reflowed at 72 characters to look good in standard console mail readers.
The text part also uses format=flowed, so it will shrink on narrow screens or terminal splits.
Fenced code blocks in the markdown are added as inline attachments with the appropriate MIME type. This makes them easy to download/save from the message.
URLs are listed at the bottom of the text message in a special text/uri-list inline attachment, and referred to with short codes like [0], [1] ... in the message text.

Written in portable C99. The only requirement is the cmark library to parse markdown.

# detect cmark and set up build flags
./configure
# then build md2mime
make

./md2mime sender-domain.com < message.md > message.email

The sender domain is required to generate a good Message-ID.

If the original message starts with headers, pass -p to preserve them. Send the message using a program like msmtp:

msmtp recipient@example.com < message.email