Please go to the addon homepage and scroll to the bottom where it says "Privacy" and read it carefully - your user info will be shared with 3rd parties and Amazon is specifically listed as one of them. Your emails go to Amazon, completely unencrypted, for Amazon to potentially scan looking for keywords to target consumers with ads (actually, TWO consumers - you and your recipient). Always look for "zero access" services when it comes to email; it means the email is encrypted before arriving to the email company and not even their own employees can read the contents - they have "zero access".