smtp.trifle.net has no MX records.
Question and response
Question
dig smtp.trifle.net. MX
Answer
The response has no answer records.
Authority
trifle.net. 3600 SOA ns.apex.dp.ua. hostmaster.trifle.net. 2020083633 36000 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0