Outgoing Blacklist Filtering Rules - Domain Level
In the Outgoing Blacklist Filtering Rules page you can view all filtering rules that have been set up for your domain's outgoing mail and you can also add new ones. Outgoing mail that matches any of the rules will always be blocked.
The rules are based on Python's regular expression (regex) syntax. (For more information on regular expressions, we recommend using an online regex checker tool to ensure any expression created is correct before applying it in Spam Experts).
You can access this page at the Admin Level and the Domain Level.