_47a48e46f3f9e6fa3a6f074309a039ea.api-s.axcient.com has no MX records.
Question and response
Question
dig _48ede5d03b80430ea082cabc6d4a7f32.hkvuiqjoua.acm-validations.aws. MX
Answer
The response has no answer records.
Authority
hkvuiqjoua.acm-validations.aws. 900 SOA ns-2003.awsdns-58.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0