I hope law enforcement was informed...
article didn't say [or else my scanning missed it] whether or not the details of the server were turned over to law enforcement, since [if it has passwords, etc.] there's likely ABUSE going on, relay-raping, joe-jobbing, and other spammer nastiness, much of which could be either sued over OR prosecuted criminally.
And if the owner of the server is simply clueless to the use for spamming, then whoever did it is doing so illegally and needs to be prosecuted for THAT, too...