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To block an entire domain, use ' * ' as a wildcard entry. For example, specifying *@pcr.com blocks all emails from the pcr.com domain.
In addition to wildcards, regular expressions may be used for both the email and subject values. They must be surrounded by slashes, for example /^blocked*/ will block anything starting with blocked. 'Whitelists' can also be created using a negative look ahead regular expression, for example /@(?!pcr.com)/ would whitelist pcr.com. Please note that only a single whitelist entry can be added, or else all emails will be blocked.
Removing Blocked Emails
If an Admin user would like to remove an address from the Blocked Emails Grid and enable correspondence from/to this address, select the appropriate item on the Grid and click the Delete Selected button 
located immediately above the Grid.
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