staging.wcon.io has no MX records.
Question and response
Question
dig staging.wcon.io. MX
Answer
The response has no answer records.
Authority
wcon.io. 300 SOA dns200.anycast.me. tech.ovh.net. 2025121800 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0