In the previous posts (part 1, part 2) we covered some required items which should be implemented to send emails safely. Here’s one more item you should consider before starting sending emails: feedback loops. It works next way. You register on FBL and if some of your recipients mark your mail as spam you will get a special message about it. So you can take necessary actions. You can get a list of available feedback loops on corresponding Wikipedia page. It’s free of charge. For MSN, Zoho and Yahoo you will need their accounts, Google doesn’t have FBL.