maybe ive missed something but i belive that

$to = 'blah@blah.ext' . ', ';
$to = 'blah@blah.ext' . ', ';
$to = 'blah@blah.ext' . ', ';
$to .= 'blah@blah.ext';

these variables are wrong your only continuing the last 2 (since the 3rd one will overwrite the previous two)

i think it should be

$to = 'blah@blah.ext' . ', ';
$to .= 'blah@blah.ext' . ', ';
$to .= 'blah@blah.ext' . ', ';
$to .= 'blah@blah.ext';

then it will foward onto all 4

__________________
Fatal error: Call to undefined function: brain() in /data/www/brain.php on line 2