mail.sddfastpay.net has no MX records.
Question and response
Question
dig mail.sddfastpay.net. MX
Answer
The response has no answer records.
Authority
sddfastpay.net. 60 SOA dns101.ovh.net. tech.ovh.net. 2024121601 86400 3600 3600000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0