spf.send.cnds.io has no MX records.
Question and response
Question
dig spf.send.cnds.io. MX
Answer
The response has no answer records.
Authority
cnds.io. 3600 SOA tick.artcodix.cloud. info.artcodix.com. 2025071103 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0