Sometimes there's nothing better than receiving an email from some long forgotten cronjob and having it formatted in nice readable HTML. Well it's alot tougher than it should be to make that happen.
The only way I've found to accomplish this is to inject 'Content-Type' headers into the email when it's being sent. And conviently, not all mail clients do this the same way.
bsd-mailx provides the most consistent way of adding arbitrary email headers to outgoing mail. You just have to be sure it's the only client installed.
Install the goods:
sudo apt-get purge heirloom-mailx sudo apt-get install bsd-mailx
To craft the email:
mailx -a 'Content-Type: text/html; charset="utf-8"' -a 'From: [email protected]' -s 'Subject' '[email protected]'