mail.hostatom.com has no MX records.
Question and response
Question
dig mail.hostatom.com. MX
Answer
The response has no answer records.
Authority
hostatom.com. 3600 SOA thms1.hostatom.com. hostmaster.hostatom.com. 2026021200 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0