31-221-76-18.cust-31.exponential-e.net has no MX records.
Question and response
Question
dig 31-221-76-18.cust-31.exponential-e.net. MX
Answer
The response has no answer records.
Authority
exponential-e.net. 3600 SOA auth0.exponential-e.net. hostmaster.exponential-e.net. 2026030201 28800 3600 864000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0