I have several e-mail accounts that are associated with shell users, allowing me shell access to the mail directory. I have had them for several years, and I cannot for the life of me recall how I got this working. I cannot associate an existing e-mail account (firstname.lastname@example.org) with a shell user, and I find no option to create an e-mail account when I create a new shell user.
Can anyone help with this? Specifically, I am trying to associate one of my domain postmaster mailboxes with a shell user so that I can access the mailbox through the shell, to delete some problem mail.