mail.bolt110a.mxthunder.net has no AAAA records.
Question and response
Question
dig mail.bolt110a.mxthunder.net. AAAA
Answer
The response has no answer records.
Authority
bolt110a.mxthunder.net. 86400 SOA ns.dnsbox.net. hostmaster.dnsbox.net. 2018113013 10000 3600 604800 172800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0