Send custom email content for new WooCommerce Users-Users Import export

functions.php

<?php
add_filter('wt_user_registration_email', 'wt_user_registration_email');
function wt_user_registration_email($mail_attrs) 
{
    $user = get_user_by('id',  $mail_attrs['user_id']);
    $first_name = $user->first_name;
    $blog_name = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
    $user_login = $user->user_login;
    $password = $mail_attrs['password'];
    $subject = 'Your account has been created!';//please change mail subject
    $mail_body = "Hi ".$first_name.",
                  Thanks for creating an account on ".$blog_name." . Your username is ".$user_login." . You can access your account area to view orders, change your password.
                  Your password has been generated: ".$password."
                  We look forward to seeing you soon.
                  ".$blog_name;//please change mail body
    $mail_attrs['subject'] = $subject;
    $mail_attrs['body'] = nl2br($mail_body);
    return $mail_attrs;
}