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?
Here's how to find the answer:
gnus
RET - open the Gnus manualmark as unread
RET - look up "mark as unread" in the indexThis gives you:
`M c'
`M-u'
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.
non-free
section.