Addresses are kept in the form of templates called patterns both in black and white lists.
A valid pattern can be formatted as <domain> or <e-mail>@<domain>, where <domain> is a series of labels glued with '.' (dot) characters. The allowed formats for the domain part are ASCII and IDN.
You can use an asterisk (*) as a substitute for a number of letters, and question mark (?) as a substitute for a single letter. For example: address@spammers.net, user?@spammers.net, *@spammers.net. Specifying *@spammers.net will block the entire mail domain spammers.net.
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