ustr.doglying.com has no MX records.
Question and response
Question
dig ustr.doglying.com. MX
Answer
The response has no answer records.
Authority
doglying.com. 10800 SOA ns1.staceyboard.com. postmaster.staceyboard.com. 2025120110 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0