[Dovecot] allow_nets

Hello,

Im using Ubuntu 8.10 with Dovecot 1.0.10.

I am using passwd files, not a MySQL database.

I have 2 files, a "users" file, and a "passwd" file.

I have added:

allow_nets=10.1.10.1 to the end of a specific users entry in the users file.

When that user tries to login, I get the following in the logs:

dovecot: 2009-02-28 09:06:59 Error: IMAP(bob@mydomain.com): Ambiguous mail location setting, don't know what to do with it: allow_nets=10.1.10.1 (try prefixing it with mbox: or maildir:) dovecot: 2009-02-28 09:06:59 Error: IMAP(boo@mydomain.com): Mail storage creation failed with mail_location: allow_nets=10.1.10.1 dovecot: 2009-02-28 09:06:59 Error: child 4174 (imap) returned error 89

here is the line from my users file:

bob@mydomain.com::5000:5000::/home/vmail/ mydomain.com/:/bin/false::allow_nets=10.1.10.1

here is the corresponding line from the passwd file:

bob@oldschoolpunk.com:$1$evcHgrbC$BuyQRCspMzTpD8zkphxo0/

My goal is, that I want to allow this user to check email ONLY from the IP specified (i.e. 10.1.10.1)

I just can't seem to get this working... Am I going about something the wrong way?

Thanks!