Sadly I think it is illegal to sing up these addresses to every service known to you... Otherwise it would be interesting SaaS opportunity. Automatically sing-up spammers to any number of newsletters or contact forms...

I think you just gave my life purpose. It will be my magnum opus.

Actually that’s already been completed, and will be released to hackernews in the coming days

Often spammers and phishers misuse legitimate emails they hacked.

Just ignore and move on.