relay1.exchange.blacknight.com has no AAAA records.
Question and response
Question
dig relay1.exchange.blacknight.com. AAAA
Answer
The response has no answer records.
Authority
blacknight.com. 3600 SOA ns1.blacknight.com. hostmaster.blacknight.com. 1276188654 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0