iad-out-004.esa.us-east-1.outbound.mail-perimeter.amazon.com has no AAAA records.
Question and response
Question
dig iad-out-004.esa.us-east-1.outbound.mail-perimeter.amazon.com. AAAA
Answer
The response has no answer records.
Authority
us-east-1.outbound.mail-perimeter.amazon.com. 900 SOA ns-423.awsdns-52.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0