If you are a moderator, you can use the `gnus-mdrtn.el' package. It is not included in the standard Gnus package. Write a mail to `larsi@gnus.org' and state what group you moderate, and you'll get a copy.
The moderation package is implemented as a minor mode for summary buffers. Put
(add-hook 'gnus-summary-mode-hook 'gnus-moderate)
in your `.gnus.el' file.
If you are the moderator of `rec.zoofle', this is how it's supposed to work:
To use moderation mode in these two groups, say:
(setq gnus-moderated-list "^nnml:rec.zoofle$\\|^rec.zoofle$")
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