Index: theme/mimemail.theme.inc =================================================================== RCS file: /cvs/drupal-contrib/contributions/modules/mimemail/theme/mimemail.theme.inc,v retrieving revision 1.8 diff -u -r1.8 mimemail.theme.inc --- theme/mimemail.theme.inc 12 Sep 2010 16:11:58 -0000 1.8 +++ theme/mimemail.theme.inc 12 Sep 2010 16:28:31 -0000 @@ -56,4 +56,6 @@ $css = wordwrap($css, 700); $variables['css'] = $css; + // Process mailkey to be a proper CSS class. + $variables['mailkey'] = 'mail-'. str_replace('_', '-', $variables['mailkey']); }