How to close an open relay on Sendmail?

Hi!  I'm new to Sendmail and have installed version 8.12.5 on a Redhat 8 machine.  It was installed using the RPM that came with RH.  Everything functions fine (as in I send and receive mail) but when I run a test here:
it says I have an open relay.  The server I am testing is My files are as follows:
commented out the line the line DaemonPortOptions=Port= so that Sendmail would listen on all devices

has the line "192.168.0" to allow my network to send mail

relay-domains is empty

has the line "" so that I accept mail for my domain.

As I stated I am new to sendmail so my asumptions about what these files do may be wrong.  Thanks alot.

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

If relay-domains is empty and you have only 192.168.0" you do not have a open relay MTA. Do not trust this

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
tmallowAuthor Commented:
I have since realized that it only allows me to relay if the recipient name is within my domain.  I guess that isn't of much use to a spammer, all they could do is send mail to my domain.  Thanks Jivko, I needed reassurance that my setup was OK.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux Networking

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.