Is Auto Post recognition a WordPress feature? How to turn it off?

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I noticed that if you go to lostlettermen.com/aa, it redirects to a post. Is this a feature in WordPress that can be turned off, or is this done by some type of plugin or custom code?

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  1. This is done by redirect_guess_404_permalink(), which is called from redirect_canonical(). redirect_canonical() does more than just this: it makes sure you are always using a single canonical URL for an item, it will add slashes, force the same domain name, …

    You can either unhook redirect_canoncial so it does nothing, or you can hook into it and prevent redirection when it is a 404:

    // Disable redirect_canonical()
add_action( 'init', 'wpse18110_init' );
function wpse18110_init()
{
    remove_action( 'template_redirect', 'redirect_canonical' );
}

// Only prevent redirect on 404
add_filter( 'redirect_canonical', 'wpse18110_redirect_canonical' );
function wpse18110_redirect_canonical( $redirect_url )
{
    if ( is_404() ) {
        return false;
    }
    return $redirect_url;
}