For example, if a particular subscriber’s message number is 4, that means that that subscriber has already received follow-up emails 1,2 and 3. So if I have a 7 part follow up message sequence and I write a brand new followup email (message 8 in the sequence), there is no real way for me to prevent this subscriber from receiving message 8 unless I make his or her message number higher than 8. But if I do this, then that subscriber will never receive messages 4,5,6 or 7.
Update: MailChimp refutes this claim about affiliate marketing saying that they only impose temporary bans when certain links in emails are blacklisted. What’s nice about AWeber is that they let you know BEFORE you send your email how likely your email will hit someone’s spam folder and whether you are accidentally using blacklisted links in your email.