melcrelay.taleo.net has no MX records.
Question and response
Question
dig melcrelay.taleo.net. MX
Answer
The response has no answer records.
Authority
taleo.net. 300 SOA ns1.p201.dns.oraclecloud.net. hostmaster.taleo.net. 598322822 3600 600 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0