Elvis Nyakangi

Since WordPress 5.5, if you have enabled plugin or theme auto-update you will receive an email notification when a plugin or them auto-update is successful or when it has failed.
If you manage a dozen of websites, then the constant stream of auto-update emails may be annoying.
This plugin seeks to cure the problem by automatically disabling plugin and themes email auto-update notifications.
All other notification will be ON. This plugin only stops plugin and theme auto-update notifications. Not core WordPress updates.
More about the Plugin
<ul>
<li>This is a lightweight plugin that is less than 2 kb and has zero effect on your website load speed </li>
<li>No settings are required. Just install the plugin, activate, and you are done. . </li>
<li>It is compatible with the latest version of WordPress. </li>
</ul>
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Disable auto-update Email Notifications

Quick way to disable the auto_plugin_update_send_email and auto_theme_update_send_email filters. Straight to the point no extra bloat.

Perfect

Simple and Effective, thanks to developer.

Simple and Effective

This plugin performs a simple task of disabling email notifications that are sent by WordPress when a plugin or theme auto-updates.

Ciprian Craciun

This plugin disable plugins, themes and core updates for WordPress and also the notifications.
It’s very important that you keep your WordPress theme, core and plugins up to date. If you don’t, your blog or website could 
be susceptible to security vulnerabilities or performance issues.
If you use this plugin, make sure you keep yourself up to date with new releases of your active WordPress version, plugins 
and themes and update them as new versions are released (simply by deactivating this plugin for a short time).

Disable Plugins, Themes and Core Updates

This plugin disable plugins, themes and core updates for WordPress and also the notifications.

Disable auto-update Email Notifications vs Disable Plugins, Themes and Core Updates