i seriously doubt it, what did hostpro actually tell you? did they say which newsgroup or what? if they didn't then ask them, it could very well be some competing website that just sent them an email saying you where. I bet they didn't even check it themselves.
Unfortunatly because we all hate spam so much some people are too quick to blame people who do nothing wrong. It dosen't appear anyone else would have done it i think most are waiting for vb 2.0 before they play with this so i would think it is just someone being a pain.
p.s. you using
http://www.newsfeeds.com - not happy about them, their article numbers on the front are their goliath server, huge huge difference to their other spamkillers server which has massivly less posts in it. Probably why we end up with so many in the temp table when really there should not be that many (how many news threads go on for more than a month say and they should have a months worth of posts). Have to cancel my account to re-sign up on the goliath server. akk...