krtl1email01.superonline.net has no MX records.
Question and response
Question
dig krtl1email01.superonline.net. MX
Answer
The response has no answer records.
Authority
superonline.net. 300 SOA ns4.superonline.net. system.superonline.net. 2026030404 3600 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0