[Dovecot] newbie: can not authenticate using dovecot

[nyoman.bogi at gmail.com]

Thanks for the advice Sir,

when I use the configuration "mail_location =
mbox:~/mail/:INBOX=/var/mail/%u"
and look at the Dovecot's log why it's rejecting my authentication :

May 18 09:26:29 pop3-login: Info: Login: user=<bogi>, method=PLAIN,
rip=127.0.0.1, lip=127.0.0.1, secured
May 18 09:26:29 POP3(bogi): Error: mail_location: mbox:
mkdir(/nonexistent/mail) failed: Permission denied (euid=1005(bogi)
egid=1005(bogi))
May 18 09:26:29 POP3(bogi): Fatal: Namespace initialization failed
May 18 09:27:45 dovecot: Warning: Killed with signal 15 (by pid=82713 uid=0
code=kill)

And Yes, I create all user with no home directory (/nonexistent) and no
shell
(basically all user will have only mail spool in /var/mail)

any suggestion to avoid this?

should I use a new directory i.e. /var/mail/dovecot with world writable to
accommodate this?

thanks in advance