Many ISPs block or junk e-mails from SFI—meaning we can't get through to these affiliates. Indeed, they may have never received our welcome letter or even our e-mails with the registration confirmation link!
YOU, however, probably can get through to CSAs you receive but who haven't confirmed their registration by e-mailing them directly. YOU can make all the difference. YOU can get them to confirm their registration (just have them log in at the Affiliate Center, and they will be provided with the link to confirm their registration).