Those who receives many messages everyday is prone to store thousands of messages in the +inbox folder. In such a case, they may want to speak out like this, "Hey messages, get out of the +inbox folder to somewhere". Mew provides a feature to satisfy such laziness. :) `M-o' is the spell.
When you execute this function, it marks specific messages with `o'. The specific messages mean messages which are not marked with `o' nor `D' if `mew-refile-auto-refile-skip-any-mark' is `nil'. If `mew-refile-auto-refile-skip-any-mark' is `t', they mean non-marked messages. The default value of `mew-refile-auto-refile-skip-any-mark' is `nil'. If executed with `C-u', the targets mean messages marked with `*' regardless the value of `mew-refile-auto-refile-skip-any-mark'.
Refile rule is the same described in the previous section. Please note that what this function does is just mark messages with `o'. Messages are not refiled until you will press `x'.
Mew's refile mechanism is so smart that it would be harmful for this function. That is, most users would not understand where messages have been refiled if Mew made most use of its guess mechanism. :) For this reason, break is provided to limit usage of guess functions. Recall the declaration up above.
(defvar mew-refile-guess-control
'(mew-refile-guess-by-alist
mew-refile-ctrl-throw
mew-refile-guess-by-newsgroups
mew-refile-guess-by-folder
mew-refile-ctrl-throw
mew-refile-ctrl-auto-boundary
mew-refile-guess-by-thread
mew-refile-ctrl-throw
mew-refile-guess-by-from-folder
mew-refile-ctrl-throw
mew-refile-guess-by-from
mew-refile-ctrl-throw
mew-refile-guess-by-default))
You can find the `mew-refile-ctrl-auto-boundary' function in `mew-refile-guess-control'. Only when auto refile is used, Mew ignores guess functions below this function. If guess functions above `mew-refile-ctrl-auto-boundary' didn't guess any folder for a message, the message is not marked with `o'. Insert `mew-refile-ctrl-auto-boundary' before you ruin.