In your email campaigns you will undoubtedly see bounces. Hard bounces are emails that were not delivered. There are essentially two reasons for this. The email could be wrong so if you do have a small subscriber list, check to make sure your email address are correct or you have been blocked. This is why it is so important to build your email list organically. This means that you have gathered emails from people and have their explicit permission to send them emails. Do not buy email lists. This can really hurt you in the long run – if enough people block or report you as spam your deliverability will plummet.