If you are using some other server like godaddy or some other server for that you need to put the settings of that particular server in its setting. I am sharing the settings for godaddy server.

$mail = new PHPMailer();
        $mail->IsSMTP(); // telling the class to use SMTP
        $mail->SMTPAuth = true;                  // enable SMTP authentication
        $mail->SMTPKeepAlive = true;                  // SMTP connection will not close after each email sent
        $mail->Port = 25;                    // set the SMTP port for the YourServer server
        $mail->Host = "smtpout.secureserver.net";         // sets the SMTP server
        $mail->Username = "yourusername@server.com"; // SMTP account username
        $mail->Password = "yourpassword";        // SMTP account password
       $mail->SetFrom('email to be visible to recipient', 'name visible to recipient');
       $mail->Subject = 'Your subject';
        $mail->AltBody = "To view the message, please use an HTML compatible email viewer!"; // optional, comment out and test
        $mail->MsgHTML('Your message');
        $mail->AddAddress($email);
        $mail->SMTPDebug = 0;
        $mail->Send();            // Clear all addresses and attachments for next