This article will walk you through the steps on how to whitelist (always approve) or blacklist (block) a sender or domain.
1) Log in using your credentials at the provided URL: https://antispam.roaringpenguin.com/canit/index.php
2) From the main screen, under Accept and Reject List, use the dropdown box to select whether you want to always accept mail from a sender/domain or always reject.
3) Enter the chosen sender/domain.
4) Click Add.
