Turns out, the mess at Blue Security, the Menlo Park anti-spam company, isn’t quite over yet. The Menlo Park company is shutting down its Web site, according to this piece in the Washington Post.

You may recall when a bunch of sites like Craiglist and Six Apart were hit a couple of weeks ago, after a Russian-based spammer counter-attacked the Blue Security’s anti-spam efforts. (Blue Security had tried to overwhelm the spammers with spam of its own — but the aggressive move backfired).

Blue Security is backed by Benchmark Capital.

Using tens of thousands of hijacked computers, the spammer flooded Blue Security with so much Internet traffic that it blocked legitimate visitors from going to Bluesecurity.com, as well as to other Web sites. The spammer also sent another message: Cease operations or Blue Security customers will soon find themselves targeted with virus-filled attacks.

Today, [Blue Security’s Eran] Reshef will wave a virtual white flag and surrender. The company will shut down this morning and its Web site will display a message informing its customers about the closure.

Ouch.