mail.smf.ragingwire.net has no MX records.
Question and response
Question
dig mail-relay.sac.ragingwire.net.smf.ragingwire.net. MX
Answer
The response has no answer records.
Authority
smf.ragingwire.net. 600 SOA ns1.ragingwire.com. support.ragingwire.com. 2018072647 14400 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0