[jasonkester]

It's probably worth noting that email you sign up to receive is not spam.

If you don't think that receiving four emails in exchange for a free month of a $60/month SaaS product is a fair deal, your options include clicking the "Unsubscribe" link on that mail or not signing up for those mails in the first place.

Penalizing the company by marking the emails you asked them to send you as spam seems like a mean thing to do.