Greylisting is a method used to reduce the delivery of junk/spam emails whilst allowing legitimate emails to be delivered.

Greylisting looks at the IP and email address of the sender and the recipient address. If our system does not recognize this information then it will temporarily reject the email. All legitimate email systems will attempt to resend the message at a later time, and the e-mail will be accepted and delivered.

Most applications that send junk/spam email only send messages once and do not attempt to resend them. As these systems do not retry the emails will never be accepted by our system and therefore not be delivered to the mailbox in question.

Greylisting does not delete legitimate email messages, it simply rejects the first attempt to be delivered. All legitimate emails will be successfully delivered using greylisting as long as the sending mail server attempts to resend the message between 8 minutes and 16 hours after the initial attempt. The potential effect greylisting may have is a slight delay in the delivery of legitimate emails.

Greylisting is turned "ON" by default for all pop3 mailboxes. You can easily disable greylisting via the Webmail interface at mail.yourdomain.com (where 'yourdomain.com' the the domain hosted with us). The option to bypass Greylisting is available in the 'My Settings' menu option.

To avoid any delays for important email you can add the senders email address or domain to your 'Trusted Senders' list. Again this is available in the Webmail interface, within the 'My Spam Filtering' menu option. Any messages sent from email addresses or domains listed in the 'Trusted Senders' list for a mailbox will bypass the Greylisting feature and be immediately delivered.