wp-config.php

<?php

// I did this simple hack on a private WordPress Multisite blog, to stop it
// sending me emails every time I created a new blog. It's definitely overkill
// to stop all emails, but unfortunately I couldn't find any hooks that let me
// be more specific! (I didn't need any of the other emails - but you shouldn't
// use this code if you do!)

// I put the code in wp-config.php. You could create a plugin instead, or
// putting it in your theme's functions.php might work (I haven't tested it).


// Disable ALL emails
function wp_mail()
{
    // Do nothing!
}