1. Once logged in to the control panel scroll down to "Extra Features" and click on "ConfigServer MSFE"
2. Click on Email Black/Whitelist settings
3. Enter the details that you would like to whitelist or blacklist as per the instructions below
(Whitelisted addresses will always be delivered blacklisted addresses will always be marked as High Scoring Spam
Allowed Format: *@domain.tld, name@domain.tld, *@*.tld or IP/CIDR, only one entry per line)