tieinterceptor1b.corp1.discourse.cloud has no MX records.
Question and response
Question
dig tieinterceptor1b.corp1.discourse.cloud. MX
Answer
The response has no answer records.
Authority
corp1.discourse.cloud. 2560 SOA ns1.discourse.cloud. hostmaster.discourse.org. 1772654134 16384 2048 1048576 2560
Additional
The response has no additional records.