How to turn sendmail authentication off

[Cameron Beattie]

I have been struggling with configuring sendmail without authentication. If 
I comment out confAUTH_OPTIONS in sendmail.mc sendmail is still requiring 
authentication.
sendmail.mc
<snip>
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`setup for Red Hat Linux')dnl
OSTYPE(`linux')dnl
dnl define ('confAUTH_OPTIONS', `A')dnl
dnl define ('confAUTH_OPTIONS', `A p')dnl
</snip>

telnet localhost 25
ehlo localhost.localdomain
<snip>
250-AUTH DIGEST-MD5 CRAM-MD5
</snip>

I want to configure sendmail so that it will only relay mail from localhost 
and will not require authentication. How do I turn off authentication?

Any help would be appreciated

Cameron