Emails not being sent via PHPMailer - arrays

Question

I took over the web development for a company and they've got a feedback form on a couple pages (colorado, prescott, flagstaff and wyoming) that submits form info to an email as a spam filter using PHPmailer. However, they're not receiving emails the way they hoped. I can get emails through all addAddress emails except for the one using $recipeint. Searched and tried everything I could think of including explode and foreach other codes. Can't get this to work. A little help would be great.
$colorado = array( "ColoradoSprings", "Denver", "Boulder" );
$colorado = array_map( 'strtolower', $colorado );
$wyoming = array( "Cheyenne", "Buffalo" );
$wyoming = array_map( 'strtolower', $wyoming );
if ( in_array( $_POST[ 'location' ], $colorado ) || in_array( $_POST[ 'location' ], $wyoming ) )
$recipient = "person1#mail.com, person2#mail.com";
switch ( $_POST[ 'location' ] ) {
case "prescott":
$recipient = "person3#mail.com, person4#mail.com";
break;
case "flagstaff":
$recipient = "person3#mail.com, person4#mail.com";
$mail = new PHPMailer;
$mail->isSMTP();
$mail->SMTPDebug = 0;
$mail->Debugoutput = 'html';
$mail->Host = 'smtp.mail.com';
$mail->Port = 587;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->Username = "senderemail#mail.com";
$mail->Password = "password";
$mail->setFrom( 'allmail#mail.com', 'Everyone' );
$mail->addReplyTo( $_POST[ "Email" ], $_POST[ "Name" ] );
$mail->addAddress( 'allmail#mail.com', 'Everyone' );
$mail->addAddress( 'random#mail.com', 'John Doe' );
$mail->addAddress( $recipient, 'Others' );

Answer 1

This is strange code, or incomplete. As it stands it will only attempt to send email if location == 'flagstaff', so you probably need to pay some attention to your conditions.
addAddress only accepts a single address; if you want to send more, call it multiple times in a loop. For example:
$recipients = ["person1#mail.com", "person2#mail.com"];
foreach ($recipients as $recipient) {
$mail->addAddress($recipient);
}