zimbra-mta01.036.ch has no MX records.
Question and response
Question
dig zimbra-mta01.036.ch. MX
Answer
The response has no answer records.
Authority
036.ch. 900 SOA ns3.036.ch. ns.computerline.ch. 2025113002 7200 3600 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0