Yeah, having a common username risks some of that. Somebody likely forgot their password and partially forgot their username and e-mail address. Digging through the logs, my best guess at who: the owner of sandygallant.
But, whoever it is, if they read this thread, they can search through all of the users with "sandy" as part of the name via ?node_id=3989;HIT=sandy;U (just hit the "Search" button after following that link) in hopes of one of them looking familiar.
That feature certainly tries to avoid allowing people to discover if a particular e-mail is being used at PerlMonks, but that also makes it rather opaque and vague so people can end up trying it over and over (because they get no solid feedback and then also get no e-mail).