$emails_list is an array, so you have to loop through it to print its values:
foreach ($emails_list as $email) {
print "email: $email";
}
Note that if you want to print an specific value, you can address with $emails_list[index]. So you can do print $emails_list[0], for example.
If you then want to print values all together, do the following:
echo "(" . implode(',',$emails_list) . ")";
Test
$a=array(1,2,3);
echo "(" . implode(',',$a) . ")";
Returns
(1,2,3)
Update
Your code in http://pastebin.com/BwWZFrzZ shows that you are using:
echo 'Email sent to:' . $emails_list . '<br/ >';
So you can print
echo 'Email sent to: (' . implode(',',$emails_list) . ')<br/ >';
Update 2
Based on the github code it comes from (https://github.com/PHPMailer/PHPMailer), you need to add one email at a time:
//this is some clever **** to do with sending emails with attachments :D
$email = new PHPMailer();
while($contacts2=mysql_fetch_array($rs))
$email->AddAddress($contacts2["email"]);
}
$email->From = '...';
echo implode(',',$emails_list);