What is Greylisting and how does it work?
Greylisting interacts with email servers sending email to UGAMail by temporarily rejecting email from the sender if email has not been previously received from that specific user account on that specific email server. According to the Internet Engineering Task Force, a properly configured email server should attempt to send the message again after a short period of time. The vast majority of all legitimate email servers are configured this way. Once the message is sent again from the originating server, the sender is added to UGAMail’s internal database for a period of 45 days. Most spammers do not have their servers configured to resend the email, which results in a great reduction in spam sent to UGAMail. All email sent from a ‘uga.edu’ address is exempt from greylisting.
