HTML Code in Mailbody

Dear all,

I love this plugin, but from time to time I only recieve html coded mails like this:

<table cellspacing=”0″ style=”font-size:12px;line-height:135%; border-bottom:1px solid #cccccc;”><tbody> <tr style=”background-color:#ffffff;”><th style=”text-align:left;color:#555555;padding:7px 9px;vertical-align:top;border-top:1px solid #cccccc;”>Anrede</th><td style=”text-align:left;color:#555555;padding:7px 9px;vertical-align:top;border-top:1px solid #cccccc;”>Frau</td></tr> <tr style=”background-color:#ffffff;”><th style=”text-align:left;color:#555555;padding:7px 9px;vertical-align:top;border-top:1px solid #cccccc;”>Vorname</th><td style=”text-align:left;color:#555555;padding:7px 9px;vertical-align:top;border-top:1px solid #cccccc;”>Sibylle</td></tr> <tr style=”background-color:#ffffff;”><th style=”text-align:left;color:#555555;padding:7px 9px;vertical-align:top;border-top:1px solid #cccccc;”>Nachname</th>…

But I don`t now why. It works fine and then (I assume after each update) I have those crypthical mails. Does anybody know, how to fix that?

BR,
DieSpeedy