40.57.253.185.isotelecom.com has no MX records.
Question and response
Question
dig 40.57.253.185.isotelecom.com. MX
Answer
The response has no answer records.
Authority
isotelecom.com. 3600 SOA dns1.namebay.com. admin.validname.com. 2025120311 10800 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0