[bjnord]

I use Informed Delivery (pretty handy), so when I started reading the article, I thought -- I should be safe, because I already signed up for the account at my address.

Not so! FTA: "Normally in these cases I’d urge readers to simply plant their flag by registering an account to claim their address. However, the USPS allows new account creations for anyone currently able to receive mail at your address, which means that claiming your address may involve registering an account with every adult present at your address."