Default WP From email

gistfile1.php

<?php
//Default From mail
function custom_wp_mail_from( $email ) {
        $handle = 'site';
	$find = 'http://www.'; 
	$replace = '';
	$link = get_bloginfo( 'url' );
	$domain = str_replace( $find, $replace, $link );
	return $handle . '@' . $domain ;
}
add_filter( 'wp_mail_from', 'custom_wp_mail_from' );
class email_return_path {
  	function __construct() {
		add_action( 'phpmailer_init', array( $this, 'fix' ) );    
  	}

	function fix( $phpmailer ) {
	  	$phpmailer->Sender = $phpmailer->From;
	}
}

new email_return_path();
//From name
add_filter('wp_mail_from_name', 'new_mail_from_name');
function new_mail_from_name($old) {
    $site_name = get_option( 'blogname');
    return $site_name;
}