What characters are never used in a newsreader?

Giganews Newsgroups
Subject: What characters are never used in a newsreader?
Posted by:  Perry Kappetein (someo…@hotmail.com)
Date: Fri, 15 Apr 2005

What characters are never used in a newsreader?
I am using #9 now for splitting my fields in a line.
are there any other characters that are not beeing used?

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