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Wildcards are special characters that are used as placeholders for other characters. A wildcard is used where another character(s) is expected but it is not known what that character(s) will be.
MailRules recognises the two wildcards commonly used in Windows.
The question mark character (?) is used to represent any single unknown character. For example:
ma?h
will match both "math" and "mash" and any other 4 character string starting with 'ma' and ending in 'h'. But, "mathematics" would not match, because the word is too long.
The asterix character (*) is used to represent any number of unknown characters. For example:
ma*
will match math, matchbox or any other series of characters as long as the string starts with 'ma'.