How to disable the “Your site has updated to WordPress x.y.z” admin email?

Using the automatic update of my self-hosted WordPress blogs, I configured automatic updates of both the WordPress core as well as WordPress plugins and themes (through this plugin).

Whenever a core update occurs, I get an email like:

Your site has updated to WordPress 3.9.2

Howdy! Your site at http://example.org has been updated automatically
to WordPress 3.9.2.

No further action is needed on your part. For more on version 3.9.2,
see the About WordPress screen: http://example.org/wp-admin/about.php

If you experience any issues or need support, the volunteers in the
WordPress.org support forums may be able to help.
https://wordpress.org/support/

The WordPress Team

I understand that I can completely disable administrative notification emails but I would prefer to only disable the above notification.

Therefore my question is:

How to disable update notification emails in WordPress?

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

In your functions.php add:

add_filter( 'auto_core_update_send_email', '__return_false' );

Method 2

An alternative is to create a simple Must-use plugin so this doesn’t depend on the theme.

Create a file wp-content/mu-plugins/disable-auto-update-mail.php

<?php
/*
Plugin Name: Disable Auto Update Mails
Plugin URI: http://wordpress.stackexchange.com/questions/157056
Version: 1.0
Author: kraftner
AuthorURI: http://wordpress.stackexchange.com/users/47733/kraftner
*/

add_filter( 'auto_core_update_send_email', '__return_false' );

This can’t be disabled by a user and works independent from any themes.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0