Editing mails in place

[Martin Julian DeMello]

A friend and I have been trying to write a macro to edit mails in place
(i.e. pipe a mail to your editor of choice, edit and save it back to the
same folder, marking the original D).

The macro to date is

macro index \ce "s/tmp/_f\ny!vim /tmp/_f && cat /tmp/_f >>$HOME/Mail/inbox\n!/bin/rm 
-f /tmp/_f\n"
macro pager \ce "s/tmp/_f\ny!vim /tmp/_f && cat /tmp/_f >>$HOME/Mail/inbox\n!/bin/rm 
-f /tmp/_f\n"

Is there any way to get the current active folder into a variable (to
replace "inbox")?

m.