www.equifax.com has no MX records.
Question and response
Question
dig www.equifax.com. MX
Answer
The response has no answer records.
Authority
equifax.com. 900 SOA ibloxgrid26.equifax.com. hostmaster.equifax.com. 2019114496 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0