[newbie]invalid sender header problem

"Tony Winslow" <[email protected]> Sun, 24 Aug 2008 19:43:51 +0800

Newsgroups	gmane.network.tin.user
Message-ID	<[email protected]>

Hi, I'm new to tin.
When I want to send a new post to the usenet,
tin says that:
Invalid sender header: [email protected].

So where can I configure that?

Thanks in advance!

Tony