WP Mail SMTP

add_filter( 'wp_mail_smtp_custom_options', function( $phpmailer ) {
    $phpmailer->SMTPOptions = array(
        'ssl' => array(
            'verify_peer' => false,
            'verify_peer_name' => false,
            'allow_self_signed' => true
        )
    );
    return $phpmailer;
} );