ovro.ovro.caltech.edu has no MX records.
Question and response
Question
dig ovro.ovro.caltech.edu. MX
Answer
The response has no answer records.
Authority
ovro.caltech.edu. 300 SOA ovro.ovro.caltech.edu. hostmaster.ovro.caltech.edu. 2022052400 600 300 3600000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0