Changing Default Sender Name and Email.

change-default-sender-name-email.php

<?php
// Function to change email address.
function ab610_sender_email( $original_email_address ) {
    return 'your_email@example.com';
}
 
// Function to change sender name.
function ab610_sender_name( $original_email_from ) {
    return 'Site or Your Name';
}
 
// Hooking up our functions to WordPress filters.
add_filter( 'wp_mail_from', 'ab610_sender_email' );
add_filter( 'wp_mail_from_name', 'ab610_sender_name' );