>>>>> Leo wrote:

> The key binding C-c C-f to the command `gnus-summary-mail-forward' is
> not available in the Article buffer. I wonder if this is a bug.

I'm not sure it is a bug, but `gnus-summary-mail-forward' seems
to have been designed for invoking in the summary buffer, not in
the article buffer (even if currently it looks possible to run
from the article buffer).  Actually the `S o m' command which is
typed in the article buffer runs `gnus-summary-mail-forward' in
the summary buffer.  However, the way that the `S o m' command
uses cannot be applied to the `C-c C-f' command[1].  That might
be the reason it hasn't been provided so far.

An easy way to achieve it is: