When I nslookup x.x.x.x my web server's IP address I get this error: Non-existent domain.
Must it return the top domain like mydomain.com or it is okay to return some.random.subdaomains.mydomain.com?
When I nslookup 144.122.145.140 (this is the IP of the email server. In the email I have received it said Received: from frigya.general.services.metu.edu.tr (frigya.general.services.metu.edu.tr. [144.122.145.140])) it returns frigya.general.services.metu.edu.tr However the emails are like e12345@metu.edu.tr
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