Hi Vlad,
in the bcc you should seperate the emailaddresses with a , not a ;
try this:
$to = "tijger@something.com";
$subject = "testing";
$msg = "this should be working now";
$headers = "Content-Type: text/html\n";
$headers .= "Bcc: recip1@aa.com, recip2@bb.com";
mail($to, $subject, $msg, $headers);
Hope it is helpfull for you.
greetings.
I often use a shell script (php) for testing this sorts of things, it is very helpfull and often quicker.