I received an email at least once a month, to an address I used exclusively for Amazon purchases, inviting me to join a website that will reimburse me via PayPal if I purchase products and review them.
I have forwarded the emails to Amazon a couple times explaining that my email address is used exclusively for them making it easier to narrow down who might be sending these emails. They always respond with a warning that my account might be suspended if I partake in such sites.