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To disable Admin email notification when a user resets their own password, create a Plugin (or Must Use Plugin) using the following code snippet:

/**
 * Disable Admin Notification of User Password Change
 *
 * @see pluggable.php
 */
if ( ! function_exists( 'wp_password_change_notification' ) ) {
    function wp_password_change_notification( $user ) {
        return;
    }
}

This will stop the following email from being sent to the Administrator's Email in Settings > General:

From: WordPress <[email protected]>
To: [email protected]
Subject: [WordPress] Password Changed

Password changed for user: username

Suppressing this email notification has to handled with a plugin because pluggable.php is loaded earlier than a theme's functions.php file.

If you wish to instead disable User email notification that a user has successfully changed their own password, use the following filter placed in functions.php:

/**
 * Disable User Notification of Password Change Confirmation
 */
add_filter( 'send_email_change_email', '__return_false' );

This will suppress the following email from being sent:

From: WordPress <[email protected]>
To: [email protected]
Subject: [WordPress] Password Changed

Hi username,

This notice confirms that your password was changed on WordPress.

If you did not change your password, please contact the Site Administrator at [email protected]

This email has been sent to [email protected]

Regards,
All at WordPress
http://example.com/