Mailcrypt knows how to rewrite USENET posts for anonymous or
pseudonymous remailing. Just compose your post or followup normally,
and use C-c / r to rewrite it for a remailer chain. You don't
even need to start your newsreader to make a post; you can just compose
a message in mail mode and replace the `To' line with a
`Newsgroups' line before doing C-c / r.
Mailcrypt will generate an error if the last remailer in the chain does
not have both the post and hash (hashmarks) properties.
The hashmarks are used to preserve `References' and similar
headers, so your anonymous or pseudonymous followups will thread
properly. The variable mc-remailer-preserved-headers controls
which headers are preserved when rewriting a message, but you should not
need to change it since the default value is reasonable.
Before rewriting, you can use C-c / p to insert your pseudonym,
and C-c / b to insert your response block, just like when
composing mail. In this case, the response block will include the
`From' line and the `Newsgroups' line (which is the news
analogue to the `To' line).