smtp2-1.dca.atomicsites.net has no MX records.
Question and response
Question
dig smtp2-1.dca.atomicsites.net. MX
Answer
The response has no answer records.
Authority
dca.atomicsites.net. 86400 SOA ns1.automattic.com. hostmaster.automattic.com. 2023092213 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0