mail.tuart.netdesignhost.com has no AAAA records.
Question and response
Question
dig mail.tuart.netdesignhost.com. AAAA
Answer
The response has no answer records.
Authority
tuart.netdesignhost.com. 10800 SOA ns1.netdesignhost.com. contact.netdesignhost.com. 1299256289 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0