I am trying to find out a way to track what the delivery rate of mails sent from our ESP is. I am aware of services like AWebber, but I was trying to find out a way to track complaints from the mail providers we send mails to using our mail server.
Is there any kind of header tag that somehow "alerts" us when an user clicks on Report Spam or something similar?
I am not trying to send spams. We just want to make sure that the emails we send to our users aren't being marked as Spam and/or reaching their inboxes.