ns1.opensrs.net has no MX records.
Question and response
Question
dig ns1.opensrs.net. MX
Answer
The response has no answer records.
Authority
opensrs.net. 60 SOA ns1.tucows.com. hostmaster.opensrs.net. 2026012101 1200 3600 2592000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0