front.siemens.flowmailer.net has no MX records.
Question and response
Question
dig front.siemens.flowmailer.net. MX
Answer
The response has no answer records.
Authority
siemens.flowmailer.net. 300 SOA ns1.flowmailer.net. contact.flowmailer.net. 2025110301 86400 7200 7200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0