bogdan-mainwp

<?php 

// Add the following code snippet to the PHP section of the MainWP Custom Dashboard Extension,
// or the functions.php file of the active theme on your Dashboard site.

add_filter( 'mainwp_updatescheck_disable_sendmail', 'mycustom_mainwp_updatescheck_disable_sendmail', 10, 1 );
function mycustom_mainwp_updatescheck_disable_sendmail( $input ) {
  return true;
}

bogdan-mainwp

<?php

// Add the following code snippet to the functions.php file of the MainWP Customisations plugin
// Download MainWP Customisations here: https://github.com/mainwp/mainwp-customisations
// More about the plugin: https://mainwp.com/mainwp-customisations/

// WP Version example
add_filter( 'mainwp-sitestable-getcolumns', 'mycustom_sites_table_column', 10 );
add_filter( 'mainwp-sitestable-item', 'mycustom_sitestable_item', 10 );