> MK> Good point. But isn't it easy thing to avoid this problem by not
> MK> appending those headers that are supposed to be appended by mbstring?
> This problem may occur when the mail() function gets reloaded.
Do you mean a case where mbstring.func_overload is enabled in
php.ini? If so, you can use mb_orig_mail() that is prepared as an alias
for the standard mail() function, though it's undocumented yet...