Disable Update Emails

// Disable auto-update email notifications

add_filter('auto_core_update_send_email', 'disable_auto_update_emails', 10, 4);

function disable_auto_update_emails($send, $type, $core_update, $result) {

    if ( !empty($type) && $type == 'success' ) {

        return false;

    }

    return true;

}

// Disable plugin and theme update email notifications

add_filter('auto_plugin_update_send_email', '__return_false');

add_filter('auto_theme_update_send_email', '__return_false');

// Disable core update notification emails

add_filter('send_core_update_notification_email', '__return_false');

// Disable email notifications for failed plugin/theme updates

add_filter('auto_plugin_theme_update_email', '__return_false');

// Disable email notifications for failed core updates

add_filter('automatic_updates_send_debug_email', '__return_false');

add_filter('automatic_updates_is_vcs_checkout', '__return_false', 1);

// Disable email notifications for background updates

add_filter('automatic_updates_complete', function($email, $type, $bulk) {

    return false;

}, 10, 3);