Text rules should be for sorting messages based on words, phrases or other characteristic text strings. (In computer jargon, a sequence of arbitrary characters is commonly referred to as a text string, or simply a string). String rules use the same search types as URL and Domain rules so you can use the "is", "contains", "starts with" and "ends with" asterisk notation for string rules as you would with URL and Domain rules. Spamphibian Gateway will look in the subject header field and the body of a message for matches to string rules. String rules are case insensitive. In addition to the asterisk search type notation, string rules also support combo rule syntax for specifying an unordered set of strings which all must be present in the message to make a match.