ash2rdr.ticketmaster.com has no MX records.
Question and response
Question
dig ash2rdr.ticketmaster.com. MX
Answer
The response has no answer records.
Authority
ticketmaster.com. 2560 SOA a1-157.akam.net. tmhostmaster.ticketmaster.com. 3080354818 600 600 1048576 2560
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0