How to change WordPress email notification sender?

As of version 4.9 there is a dubious “feature” that prevents you from changing the site email without a confirmation email going out, and the admin confirming his own change. Those filters, as you’ve discovered, won’t work.

For instance, from now on, if you’re using WordPress for an IOT device or on localhost, it’s impossible for an admin to change the site admin address on a single site.

You’ll have to remove the new hooks, and plop in your own.
I put a plugin on the .org repo that does this. You can use that and just put your own values in.
https://wordpress.org/plugins/change-admin-email-setting-without-outbound-email/

Here is the code on Github:
https://github.com/JohnDeeBDD/change-admin-email/blob/master/change-admin-email.php