[exim] mailman problem

Hi

I'm not sure if this is the correct list to post this to but here goes.
I am running exim-4.50 and mailman-2.15.
I seem to be running into problems running mailman. As far as I know
it, exim runs as root. So I installed mailman with
'--with-mail-gid=root'. Now when I post to my newly created list, I get
the following in my mainlog:

R=mailman_router T=mailman_transport defer (-29): User 0 set for
mailman_transport transport is on the fixed_never_users list

Which is what I would expect as I compiled it with 'fixed_never_users'.
The exim docs say that this isn't overridable by the config file too.

Do I need to run exim as a normal user to use mailman?
What problems will I run into, if any?
What are the implications of removing 'fixed_never_users' from my
Makefile and recompiling?

If anybody on this list uses mailman, could you please point me in the
right direction.

Thanks in advance

Kev