smtp-relay.adams.net has no MX records.
Question and response
Question
dig smtp-relay.adams.net. MX
Answer
The response has no answer records.
Authority
adams.net. 3600 SOA ns.adams.net. noc.adamstel.com. 2025112101 43200 900 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0