spf.maychuemail.com has no CNAME records.
Question and response
Question
dig spf.maychuemail.com. NS
Answer
The response has no answer records.
Authority
maychuemail.com. 1070 SOA nsbak.pavietnam.net. hostmaster.maychuemail.com. 2025091912 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0