spfext.bitsdata.online has no MX records.
Question and response
Question
dig spfext.bitsdata.online. MX
Answer
The response has no answer records.
Authority
bitsdata.online. 1800 SOA ali.ns.cloudflare.com. dns.cloudflare.com. 2394209753 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0