[otrs] Match criterias in filter creation

Hi All, While describing new filters for the tickets there are criterias like: Error-to, Importance, In-Reply-to, List-Archive, List-id, Organization, Precedence, Reply-To, Replyto, Resent-From, Resent-to, X-Mailer.. What meaning do these variables have?? There is no information in the doc. related to these variables. Hope there is someone knows what they mean :) Thanks for your time, ibrahim ALIZ conVISUAL A.G. Oberhausen, Germany __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com