syn-071-068-108-083.res.spectrum.com has no MX records.
Question and response
Question
dig syn-071-068-108-083.res.spectrum.com. MX
Answer
The response has no answer records.
Authority
res.spectrum.com. 14400 SOA auth1.charter.com. hostmaster.charter.com. 2019211617 7200 3600 604800 14400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0