[Exim] exim on multiple machines via NFS

I'm sure I'm missing something as I'm quite inexperienced with NFS, but
I can't figure it out.

I am trying to run Exim in a multiple machine setup (1 machine handles
input and output, one handles output only). On one machine I added
/var/spool/exim to the /etc/exports, and I nfsmounted it rw on the other
machine. I also added nfsnobody to the exim group. But despite nfsnobody
being in exim's group, I cannot make the "remote" exim properly access
the files from the "local" machine. I don't understand why. My
/etc/exports on the NFS server reads:

/var/spool/exim 192.168.0.0/24(rw)

and on the "remote" machine, it's mounted with:

mount -t nfs server:/var/spool/exim /var/spool/exim -o rw

no matter what I try, I get errors like:

1BaPv1-0000xa-KL Couldn't create message log
/var/spool/exim/msglog//1BaPv1-0000xa-KL: Permission denied

or
1BaRvZ-0001AH-6c Couldn't chown message log
/var/spool/exim/msglog//1BaRvZ-0001AH-6c: Operation not permitted


I know people here have done it. What am I doing wrong? Is there a way I
can connect to the NFS as a specific user vs just as the anonymous user?

Thanks!






--
-- Dan