Have you tried contacting the folks at tonic.to? I know them and they have a shoot first, ask questions later policy about spam. Here's a quote from their FAQ page.
Tonic feels very strongly that the sending of unsolicited bulk email or excessive Usenet posting ("spamming") constitutes theft of service, and we do not condone the use of .TO domain names for this purpose.
If we receive complaints that a .TO domain name has been used for this purpose, we will advise the domain owner of the complaint and request that they desist from this activity. Tonic reserves the right to remove any .TO name registration if a name is used as a source of spam, or an address to which to reply to such bulk mail solicitations. We will also publish the names and contact information for any accounts terminated for such a reason.
John -- John Harkin Internet Network and Systems Consulting jh@harkin.net voice: 415-472-2452 fax: 415-472-2454