Change the Email users receive after registration

gistfile1.php

function pb_custom_email(){
$content = <<<EOD 
<h1>Hello to our site</h1>
<p>Something interesting to tell to our new registered user</p>
<img src="https://www.google.com/images/srpr/logo3w.png" alt="the google logo" />
EOD;

return $content
}
add_filter("wppb_register_email_content", "pb_custom_email");