| What is greylisting in Yahoo! Mail? Yahoo doesn't use greylisting, they seem to use something similar, but it's not greylisting. On standard greylisting, you send an e-mail, it gets deferred, your mail server resends later on and it gets accepted. Then after that, e-mails from that e-mail address / IP and "helo" combination don't get deferred the next time. Yahoo does it differently and will sometimes defer multiple times before accepting. |