ticketmaster.net has no MX records.
Question and response
Question
dig ticketmaster.net. MX
Answer
The response has no answer records.
Authority
ticketmaster.net. 2560 SOA a1-157.akam.net. tmhostmaster.ticketmaster.com. 2026021600 600 600 1048576 2560
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0