Canceling News Interface Forwarding
The message-supersede
command pops up a message buffer that will
supersede the message in the current buffer.
Headers matching the message-ignored-supersedes-headers
are
removed before popping up the new message buffer. The default is
`^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Xref:\\|^Lines:\\|
'.
^Received:\\|^X-From-Line:\\|Return-Path:\\|^Supersedes: