How to send HTML mails from CLI

1. Create the email body.

To: address@example.com
Subject: Subject

Content-Type: text/html; charset="us-ascii"
/* You can of course add more header lines if necessary. */

2. You of course have to replace the To address and the subject line.

3. Save this as mail_html.html.

4. Use sendmail to send this message:

# /usr/sbin/sendmail address@example.com < mail_html.html