Where is maildirmake?
When I run maildirmake I get maildirmake: command not found. Where is it, and if it's not included in Ubuntu 11, how do I install it?
Do you have an email service installed on your system such as courier or dovecot? Look at this link. Actually maildirmake is a symlink to one of these packages maildirmake binary like /usr/bin/maildirmake.courier.
On Ubuntu the command is maildirmake.dovecot. If you want to use the plain command maildirmake on Ubuntu, you have to install maildrop (aptitude install maildrop).