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This is a simple question, but I did not find an answer:

How can I change a read message to "unread" and how can I toggle the read state of a message?

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up vote 6 down vote accepted

You can clear its mark by Mc or M-u.

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Thanks - working nicely – Rainer Mar 29 '13 at 12:11

Here's how to find the answer:

  • C-h i - open Info
  • m gnus RET - open the Gnus manual
  • i mark as unread RET - look up "mark as unread" in the index

This gives you:

`M c'
     Clear all readedness-marks from the current article
     (`gnus-summary-clear-mark-forward').  In other words, mark the
     article as unread.

Though you have the correct answer already, I just wanted to grab the opportunity to show that the Gnus manual is actually quite easy to access.

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Thanks - but the strange thing is: I do not have the gnus manual there? Any suggestions? – Rainer Apr 3 '13 at 16:39
Are you by any chance using Emacs from Debian packages? Debian considers the GNU Free Documentation License (GFDL) non-free in certain cases, so the Emacs documentation is in the emacs23-common-non-dfsg package in the non-free section. – legoscia Apr 3 '13 at 17:41
Spot on - I am using ubuntu and emacs24 and there is the dfsg package. Installed and there it is - thanks – Rainer Apr 4 '13 at 8:51

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