Why not make notmuchmail handle multiple messages per file? I have around 8000 files, and most of them contain hundreds of messages. I'd hate to split them out into one message per file.
-- Dr Richard Stallman President, Free Software Foundation 51 Franklin St Boston MA 02110 USA www.fsf.org www.gnu.org Skype: No way! That's nonfree (freedom-denying) software. Use free telephony http://directory.fsf.org/category/tel/