set alias for mail folder

[Percy Foreman]

I'm trying to figure out how to alias a mail folder so I can type  
'@folder' instead of '/home/test/mail/inbox' when trying to change.

I tried putting
alias folder '/home/test/mail/inbox'
into muttrc, but mutt responds with
opening _home_test_mail_inbox
Of course he can't find it, so I don't know.
thanks, P