spam2.hosted.systemlifeline.com has no MX records.
Question and response
Question
dig spam2.hosted.systemlifeline.com. MX
Answer
The response has no answer records.
Authority
hosted.systemlifeline.com. 300 SOA ns3.systemlifeline.com. jpagano.systemlifeline.com. 2026022700 3600 1800 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0