[batmanfan]

It seems I could only add one email account e.g admin for any email notification e.g. new user registration. Is it possible to have an email notification sent to another admin or moderator?
Thanks.

[tharsheblows]

There’s probably a plugin for it but I would cheat and make an email address that forwarded to all of the email addresses I wanted. I’ve had a couple of email customisation plugins fail over various updates, so I don’t have any to recommend!

Otherwise, the new user notification emails are pluggable functions which means that you need to override them in a plugin. The function in question starts at line 1569 here: https://github.com/WordPress/WordPress/blob/master/wp-includes/pluggable.php

Don’t edit that code – it will get overwritten in a future update – that’s just the function that you would use to make your own plugin (or what any plugin that does it will use).