Holy sheep shit! I just fixed a known (to me) bug in the vox-crossposter WP plugin I wrote a LONG time ago.
All I changed was the character encoding from
$email_headers .= 'Content-type: text/html; charset=iso-8859-1'."\r\n";
to
$email_headers .= 'Content-type: text/html; charset=utf-8'."\r\n";
If you look at the second “known bugs” list at http://www.acedanger.com/vox-crossposter, you will see exactly what I changed. Now I need to get home so I can update the download link and the download from the WordPress Plugin site.Edit: I updated the source that the download link points to.