HTML in incoming mail subjects can mess up rest of the site

[ja-stiebing]

The rest of the main mail list will disappear if the subjects 
contains something like the following, perhaps no HTML 
should be allowed in the subject to prevent messing up 
the site.
</td></tr></table><div style="display:none;">

Perhaps just adding following line after line 344 in 'func.
inc' would help?
$cont.=htmlentities($cont);