Do blocked senders entries need to be full email addresses or domain names?

In the "Blocked Senders" dialog, where sender emails or domain names can be entered in a comma-delimited format for blocking - do partial entries work or will Outlook only block if the entry is a full email or fully qualified domain name? For instance, if I enter "rasberryketone,*** Email address is removed for privacy ***" in this box, will any sender with "rasberryketone" in their email address or domain name be blocked?