As of WordPress 5.5, email notifications will be sent after each attempt to auto-update a plugin or theme regardless of outcome (success or failure).
If you are managing many sites, these plugin and theme auto-updates email notifications might be annoying to you than useful.
The following snippet can be used to disable email notifications for themes and/or plugins auto-update:
add_filter( 'auto_plugin_update_send_email', '__return_false' ); add_filter( 'auto_theme_update_send_email', '__return_false' );
In case it helps, here’s how to add custom codes to your site.
The Easy Way
If you do not want to use code snippet, you can install the Disable auto-update Email Notifications plugin. Just install and activate the plugin. Absolutely, no configuration is required.
That’s it. Thank you!