sendmail_enable in rc.conf

Thu Apr 27 00:41:22 UTC 2006

I have FreeBSD 6.0-RELEASE.
It seems there is collision between /etc/defaults/rc.conf and 
/etc/rc.sendmail in sendmail startup control.
In /etc/defaults/rc.conf:
sendmail_enable="NO"    # Run the sendmail inbound daemon (YES/NO).
In /etc/rc.sendmail:
"<...>
start_mta()
{
         case ${sendmail_enable} in
         [Nn][Oo][Nn][Ee])
                 ;;
<...>".
So sendmail doesn't startup during system startup only if there is 
"sendmail_enable="NONE"" in /etc/rc.conf.
Maybe I don't understand something?