Not a real bug but a incorrect example: http://www.php.net/manual/en/function.mail.php
Example 4. Sending complex email.
 
doesn't work because:
$headers .= "bcc: birthdaycheck@php.net, birthdaygifts@php.net\n"; // BCCs to

contains a trailing \n (last thing in the header may not contain a \n)

under the example stand:
"Note: Make sure you have no new-line (or other whitespace) after your to or subject parameters, as this may cause strange results. "

This is very unclear, as i, have been poundering for a while what the f*ck the problem was :)

Greetings,
Alain