mail2.amazontvnet.net has no MX records.
Question and response
Question
dig mail2.amazontvnet.net. MX
Answer
The response has no answer records.
Authority
amazontvnet.net. 3600 SOA dns1.servidoresph.com. cp008.servidoresph.com. 2026020401 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0