If you are a large-volume sender of email, you should be signed up for all the feedback loops that are available. Why? Because feedback loops are a great way to report spam, increase customer satisfaction, and reduce sender questions and end-user complaints.
Feedback loops enable your subscribers, who are the customers of Internet service providers (ISPs) or mailbox providers, to report spam via their Web-based mail service (e.g., Gmail) or custom email client (e.g., Outlook)—and funnel those spam complaints back to the email sender.
Originally conceived as a tool for ISPs to use to identify abuse coming from their servers and networks, feedback loops are now available (via ISPs) for email marketers, publishers, and other senders to enroll in. In fact, traditional bulk senders have even made it standard practice to do so.
You're not a spammer, so why are your subscribers marking your mail as spam?
Subscribers may report mail they signed up for as spam because they feel the messages aren't relevant to them anymore, they find it too difficult to unsubscribe, or they receive too many messages. Subscribers also complain if they didn't give explicit permission for you to email them, or if your messages turn out to be different from what they thought they were signing up for.
In addition to helping the global anti-spam fight, feedback loops will help reduce your complaint rate per IP address and improve your reputation as a marketer, helping to ensure that your emails reach your customer's inbox.
By removing subscribers who don't want to receive your emails, you'll reduce your complaint rate because chances are they won't complain again. And if you have low complaint rates, ISPs are much more inclined to allow your messages to reach the inboxes of those subscribers who really do want to receive them.
A 2009 study by Return Path found that 20% of legitimate email never makes it to the inbox. Why? Because of email delivery problems based on sender reputation. Your sender reputation is critical to inbox deliverability, and subscriber complaint rates could be keeping you out.