OK. I figured out my problem. I found & read the README in /Library/Documentation/Administration/Services/sendmail
and the error I received was due to permissions/ownerships of directories.
Sorry for clogging the forum but maybe this will help someone in the future.
I'm trying to configure sendmail and I'm getting the following message when trying to use the local sendmail to accept email for delivery from both /usr/bin/mail and "nmh's send/comp".
451 4.3.0 Temporary system failure. Please try again later.
I have a 10.2.3 system.
I started with...