site.cms.mpg.de has no MX records.
Question and response
Question
dig site.cms.mpg.de. MX
Answer
The response has no answer records.
Authority
cms.mpg.de. 86400 NS dns1.gwdg.de.
cms.mpg.de. 86400 NS dns2.gwdg.de.
cms.mpg.de. 86400 NS sat.mpcdf.mpg.de.
cms.mpg.de. 86400 NS dns3.gwdg.de.
cms.mpg.de. 86400 NS ns1.es.net.
Additional
sat.mpcdf.mpg.de. 86400 A 130.183.1.21
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0