(1) In the mails list, select the mails you intend to add to Block List. Then, on the toolbar, open the Spam drop-down menu and select Add to Block List.
(2) In the [Block Addresses List] page, all IP, Hostname or Email Addresses of the selected mails are displayed. Select those entries you intend to block and click OK.
(3) You will no longer receive mails from these IP, Hostname or Email addresses.
3. Retrieving and Sending Mails-Advanced