[imp] warning unknown modifier

[Andreas Moroder]

Hello,

when I open a Mail I got, IMP shows me this error

Warning: preg_replace(): Unknown modifier '\' in 
/srv/www/htdocs/horde/lib/Horde/MIME/Viewer/richtext.php on line 135

but the text is shown even if it is not well formatted an there are many
à in the text.

I have to add, that imp is much better then thunderbird that shows only 
crap like this

width="386">style="font-size:16px;line-height:20px; 
color:#0084C9">Aggiorni oggi stesso il software gratuitamente*:

Bye
Andreas