I hear what your saying I just do not see in vbulletin what option they use for that is what I am saying. Obviously we are using the common normal vb
santitation routines in vb
which is what vbgallery does.
I checked vbulletin sendmessage.php script and this is what they do
Content visible to verified customers only.
Therefore from what I see using TYPE_STR would be the same as vbulletin forum is using to sanitize email message or sender email.