Email - Multiple Recipients

$to = "yourplace@somewhere.com,another@elsewhere.com";

firstemail@here.com
secondemail@there.com
yourplace@somewhere.com
another@elsewhere.com

<?php
// read the list of emails from the file.
$email_list = file("elist.txt");

// count how many emails there are.
$total_emails = count($email_list);

// go through the list and trim off the newline character.
for ($counter=0; $counter<$total_emails; $counter++) {
   $email_list[$counter] = trim($email_list[$counter]);
   }

// implode the list into a single variable, put commas in, apply as $to value.
$to = implode(",",$email_list);

$subject = "My email test.";
$message = "Hello, how are you?";

if ( mail($to,$subject,$message) ) {
   echo "The email has been sent!";
   } else {
   echo "The email has failed!";
   }
?>