Hello,
> What's the best way to automatically or manually select messages
> (according to a spam pattern for example) and copy them all to another
> folder?
you don't. Use procmail. I personally use the following.
# this makes one spam tag superset another one.
unset spam_separator
spam "^X-Spam-Level: [*]{8}" "SPAM"
You can tag mark or do whatever you like with the messages with the
following (in my case):
~H SPAM
Honestly,
Thomas