mrelay.sui-inter.net has no MX records.
Question and response
Question
dig mrelay.sui-inter.net. MX
Answer
The response has no answer records.
Authority
sui-inter.net. 600 SOA ch.pro.io. hostmaster.sui-inter.net. 2026020512 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0