I have a list of emails from customers on ebay. I imported the list of customers to my autoresponder and have being doing email marketing. The email is white hat (i.e. address, unsubscribe). I sent 3 emails out over the last week. Today a customer sent a nasty email saying he has been trying to unsubscribe and we keep email him. He then threatened us to see what happens next. I went into the suppression log of the AR and with the 3 emails, it showed that the only unsubscribe was today. The previous emails were only looked at by him. Is there anything I need to worry about? Anything I need to do?