Email Marketing: There are two types of marketing by emails
1) Permission based marketing: Send an introductory email asking for permission to send email marketing. If I respond "Okay", then you may proceed.
2) Forgiveness based marketing: Spammer just goes ahead and blasts me with spam, offering a link to unsubscribe. Why is it my responsibility to unsubscribe from emails that I never subscribed to?
Don't assume that your email "got lost". I received it. It's just a waste of my time to respond. I never buy spammed products.