ip03.mg.infinitecampus.org has no MX records.
Question and response
Question
dig ip03.mg.infinitecampus.org. MX
Answer
The response has no answer records.
Authority
mg.infinitecampus.org. 900 SOA ibpubdns-inf001.infinitecampus.com. hostmaster.infinitecampus.org. 2023105363 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0