add_action('phpmailer_init','mail_setup');
function mail_setup($mailer){
$mailer->isSMTP();
$mailer->Host = 'smtp.gmail.com';
$mailer->SMTPAuth = true;
$mailer->Username = 'bfaisald01@gmail.com';
$mailer->Password = '*********';
$mailer->SMTPSecure = 'tls';
$mailer->Port = 587;
}

<?php wp_mail( 'faisal1534@gmail.com', 'Test subject', 'This is test mail.'); ?>