Outlook and/or hotmail doesn't seem to reply to just blockquote/cite
very well.
if (!empty($msg_text) &&
($compose_html || ($msg_text['mode'] == 'html'))) {
$msg = '<p>' . $this->text2html(trim($msg_pre)) . '</p>' .
- '<blockquote type="cite" style="background-color:#f0f0f0">' .
+ '<blockquote type="cite" style="background-color:#f0f0f0;border-left:1px solid blue;padding-left:1em;">' .
(($msg_text['mode'] == 'text') ? $this->text2html($msg_text['text']) : $msg_text['text']) .
'</blockquote>' .
($msg_post ? $this->text2html($msg_post) : '') . '<br />';