Mutt: No Mailbox error

[Matt Herzog]

My mutt can't find its mailbox no matter where I put it.
I can't see where my ~.muttrc might be conflicting with
the system Muttrc. Sometimes I get messages saying,
"You have mail in /var/mail/myusername" but the +mbox
is an empty file when I look at it.

-
Subcription/unsubscription/info requests: send e-mail with
"subscribe", "unsubscribe", or "info" on the first line of the
message body to discuss-request at blu.org (Subject line is ignored).