www.farsightsecurity.com has no MX records.
Question and response
Question
dig e5mcg80stuv1.wpeproxy.com. MX
Answer
The response has no answer records.
Authority
wpeproxy.com. 1800 SOA darwin.ns.cloudflare.com. dns.cloudflare.com. 2397565278 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0