Ask HN: iContact's email databases may have been compromised. What would you do?

I have been receiving a lot of spam lately. I tack the company's name onto email newsletters so that I'm able to identify the source of spam. One recent trend I've noticed was spam to the email addresses used for: 1. Qatar Airways 2. Invision Power Services 3. Zibbet<p>The one thing I've found in common for all three is that they use iContact for email distribution. It's reasonable to conclude that spammers may have acquired my email address through the service. I could always block the email addresses and let it be, but I'm never comfortable when other personal information could have been compromised as well.<p>What would you do?