Business customers, if you are experiencing repeat problems with known domains or senders being caught in your spam filter, you can add them to your whitelist to ensure that all messages are promptly delivered to your Inbox. You can add complete email addresses or partial matches, i.e. @domain.com.
For emails that you do not want to receive, the same holds true. Simply add those senders/domains to the blacklist to ensure that no messages from these sources are delivered to your Inbox.