mxbackup.pacificinternet.com has no AAAA records.
Question and response
Question
dig mxbackup.pacificinternet.com. AAAA
Answer
The response has no answer records.
Authority
pacificinternet.com. 300 SOA dns1.pacificinternet.com. noc.pacificinternet.com. 2025121600 7200 1800 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0