why is my spool read-only?

[Sam Roberts]

mutt says my /usr/spool/mail/sam spool file is read-only, any
idea why? It's only used for local-to-my-machine mail, but
I'd like to have it be read/write.

For incoming mail I'm working around this by having a =spool mailbox
in ~/Mail/spool, and I get my mail from a pop server when I'm
in that mailbox, but it's a little strange. Is some kind of
file-locking being triggered that's not working?

I'm using 1.0.1i, btw, on QNX4.

Sam

-- 
Sam Roberts, sroberts at uniserve dot com, www.emyr.net/Sam