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The message-cancel-news command cancels the
article in the current buffer.
The value of message-cancel-message is inserted
in the body of the cancel message. The default is ‘I
am canceling my own article.’.
When Message posts news messages, it inserts
Cancel-Lock headers by default. This is a
cryptographic header that ensures that only you can cancel your
own messages, which is nice. The downside is that if you lose
your .emacs file (which is where Gnus stores the
secret cancel lock password (which is generated automatically the
first time you use this feature)), you won’t be able to
cancel your message. If you want to manage a password yourself,
you can put something like the following in your
~/.gnus.el file:
(setq canlock-password "geheimnis"
canlock-password-for-verify canlock-password)
Whether to insert the header or not is controlled by the
message-insert-canlock variable.
Not many news servers respect the Cancel-Lock
header yet, but this is expected to change in the future.