I've filled two formal complaints to an EU regulator regarding spam (one is a company, another an individual). The first complaint was made back in early 2014,

I've filled two formal complaints to an EU regulator regarding spam (one is a company, another an individual). The first complaint was made back in early 2014, and a few weeks ago I got a response from the competent authority. They fined the company with just over €30,000. I'm still waiting on the second complaint. On both occasions I was receiving emails/spam I never signup for, and on both occasion I tried (several times) to contact the sender directly asking to be unsubscribed. Neither responded to my emails (and I've tried various different email addresses). When the path of least resistance is filling a complaint, senders should expect no less. And if you decide to spam people, make it easy to unsubscribe, because the next fastest option is to file a complaint, and fines don't come cheap.