LOL! Interesting request. I assume you want to check some filtering and what not. The best thing that I can suggest is to register a crap domain, make it private, and then sign up for as many porn sites as you can, and believe me, you will get spammed.
I had a client that had left go an employee, after this employee was fired she must have spent days signing up her ex-employer's email with dozen's if not hundreds of porn sites. Within 2 weeks her email was getting thousands of email's per second. We spent a month trying to resolve and unsubscribe, but it just kept getting worse. So I just set her up with another email account else where.