christopher-ew.state.gov has no MX records.
Question and response
Question
dig christopher-ew.state.gov. MX
Answer
The response has no answer records.
Authority
state.gov. 900 SOA o-bimc-dns001.grid.state.sbu. hostmaster.state.gov. 78824 10800 1080 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0