Change email/user for WP emails

functions.php

add_filter( 'wp_mail_from', 'my_mail_from' );
function my_mail_from( $email )
{
    return "change-this-to-your-email-address";
}

add_filter( 'wp_mail_from_name', 'my_mail_from_name' );
function my_mail_from_name( $name )
{
    return "My Name";
}