_ext.axiell.com has no MX records.
Question and response
Question
dig _ext.axiell.com. MX
Answer
The response has no answer records.
Authority
axiell.com. 600 SOA ns1-04.azure-dns.com. hostmaster.axiell.com. 2025070900 14400 3600 1814400 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0