spf.doxim.com has no MX records.
Question and response
Question
dig spf.doxim.com. MX
Answer
The response has no answer records.
Authority
doxim.com. 1800 SOA ivan.ns.cloudflare.com. dns.cloudflare.com. 2398202014 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0