How can I disable open relay?

Hi all,

My ISP said my server is open relay and request me to disable the open relay.

Does any body how can I do it?

I am on Linux and using sendmail 8.9.3.

I went to webmin --> servers --> Sendmail Configuration --> Spam Control (access)

I see :

localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY

Is it mean my server is open relay? If yes, what should I add in order to disable it?

Max

 

 

 

 

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