<style> body not stripped in plain text

The plain text stripping does not strip out style tags, which can lead to a huge mess of CSS styling atop the plain text version for heavily styled messages. I don't have time to make a patch against head, so this is a local patch, but it's a simple enough change to apply manually if needed anyway:

Simply add the following line into the array in the _mimemail_html2text() function in mimemail.inc:
'/<style[^>]*>.*?<\/style>/i' => '',