Is it possible to use a Maildir as the mailspool for users on a *nix box? I can get procmail to deliver to a Maildir without any problem, but I want to keep all the nifty features like finger knowing when mail last came in and shells alerting users when they have new mail...
UPDATE: So, investigation shows that there is no "default mailspool" on a general level. Finger (the client, not the server) has a hard-coded path. pam_mail is what does the new mail notifications and has its own config, etc... so there is no "one place" to change this.
The short answer is no, since both finger and the shell rely on the access time of the mailbox in /var/mail (in mbox format) to display such information. However, you could write a daemon that could "biff" logged-in users and modify ~/.plan appropriately to contain such information.
finger, at least on FC14, is hard-coded to check /var/mail/username. For the shell there is the PAM modulepam_mailthat understands maildir.