I'm also getting blank mails.
It seems that tapatalk is the reason for the mails?
Version 4.8.0 Plugin: Tapatalk: Tapatalk Image Link
Code:
$postbits = preg_replace_callback('/(<img src=")(http:\/\/img.tapatalk.com\/d\/[0-9]{2}\/[0-9]{2}\/[0-9]{2})(.*?)(".*>)/i',
create_function(
'$matches',
'return \'<a href="http://tapatalk.com/tapatalk_image.php?img=\'.urlencode(base64_encode($matches[2].\'/original\'.$matches[3])).\'" target="_blank" class="externalLink">\'.$matches[1].$matches[2].\'/thumbnail\'.$matches[3].$matches[4].\'</a>\';'
),
$postbits);
Could this be the reason for sending out the mails?