You would like to know the MX record for a certain domain.
You can use the command host:
lubby.org has address 184.108.40.206
lubby.org mail is handled by 10 lubby.org.
lubby.org mail is handled by 20 mx01.kundenserver.de.
This will show you which servers are responsible for your mail.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.