invitbio.com has no MX records.
Question and response
Question
dig invitbio.com. MX
Answer
The response has no answer records.
Authority
invitbio.com. 1800 SOA glen.ns.cloudflare.com. dns.cloudflare.com. 2394991429 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0