I purchased this as a time saver to email existing clients. Unfortunately it never worked as advertised, sending weird characters as first (Mark advised not to copy-and-paste characters in the email, so I removed them, and then it worked.) But it sent many emails duplicated, which looked unprofessional. Mark advised this had been fixed on March 18th. He followed up to see if it was resolved on the 19th, which I thought was good customer service. Unfortunately I was busy and didn't circle back until I had something critical to send last week. It didn't send at all. I contacted Mark and never heard back. Since the refund period was coming up today, I decided to refund.