[Dovecot] Permission denied: failed to chdir to /home/paul

Hi,

I've been trying to set up Exin and Dovecot and think I've almost gotten there. However I'm not recieving mail to my inbox and I get messages like the following in /var/log/exim/main.log:

2005-09-28 04:14:47 1EKZtf-0003gQ-26 <= users-return-105525-paul= paulororke.net@openoffice.org H=s002.sfo.collab.nethttp://s002.sfo.collab.net( openoffice.org http://openoffice.org) [64.125.133.202http://64.125.133.202] P=smtp S=3120 id=200509280613.08050.dlewis@delewis.com 2005-09-28 04:14:47 1EKZtf-0003gQ-26 == paul@paulororke.net R=localuser T=local_delivery defer (13): Permission denied: failed to chdir to /home/paul

How do I make it so that this doesn't happen?