dialup-4.78.16.2.Dial1.Philadelphia1.Level3.net has no MX records.
Question and response
Question
dig dialup-4.78.16.2.Dial1.Philadelphia1.Level3.net. MX
Answer
The response has no answer records.
Authority
Dial1.Philadelphia1.Level3.net. 3600 SOA poolns1.Level3.net. dns.level3.net. 2022082900 7200 600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0