% dig ns erde.lu
erde.lu.  86400 IN NS ns1.he.net.


% dig mx erde.lu @ns1.he.ne
erde.lu.  86400 IN MX 10 mxext1.mailbox.org.


% dig ns mailbox.org
mailbox.org.  371 IN NS ns.jpberlin.de.


 % dig mxext1.mailbox.org @ns.jpberlin.de
mxext1.mailbox.org. 900 IN A 80.241.60.212

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