Using Usenet options when posting to a Usenet group with Gnus

[Merciadri Luca]

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Hi,

When I post to a Usenet group with Gnus, I would like to enjoy the
available options defined on Usenet's groups, e.g.

1. Automatically remove my post after x days,
2. Send some attachment together with the message,
3. [Are there other options?]

How can I achieve this thanks to Gnus?

Thanks.
- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- -- 

Do not triumph before the victory.
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