ns21.mjwebexperts.host has no MX records.
Question and response
Question
dig ns21.mjwebexperts.host. MX
Answer
The response has no answer records.
Authority
mjwebexperts.host. 86400 SOA ns104.mjwebexperts.host. jose.mjwebexperts.com. 2026012901 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0