[Exim] SMTP auth

In an effort to get SMTP authentication working I upgraded to exim 4 yet
I'm still out of luck. I've compiled in AUTH_PLAINTEXT just so I can get
the basics working. My runtime config has the following it it:

# There are no authenticator specifications in this default configuration
file.

begin authenticators

fixed_plain:
  driver = plaintext
  public_name = PLAIN
  server_condition = \
    ${if and {{eq{$2}{ph10}}{eq{$3}{secret}}}{yes}{no}}
  server_set_id = $2

host_accept_relay = *
host_auth_accept_relay = *

Exim craps out with the following:

Exim version 4.03 #3 built 17-Apr-2002 10:26:55
Copyright (c) University of Cambridge 2002
2002-04-17 13:24:45 Exim configuration error in line 528:
option "host_accept_relay" unknown

I've looked at the arcihves and it appears I may need to do something with
pam. I'm unfamiliar with Solaris 8 pam (there is an /etc/pam.conf). Any
idas?

Thanks.