Question and response
Question
dig smtpout.zixmail.net. A
Answer
smtpout.zixmail.net. 600 A 63.71.8.103
smtpout.zixmail.net. 600 A 63.71.8.104
smtpout.zixmail.net. 600 A 63.71.8.105
smtpout.zixmail.net. 600 A 63.71.8.106
smtpout.zixmail.net. 600 A 63.71.8.107
smtpout.zixmail.net. 600 A 63.71.8.108
smtpout.zixmail.net. 600 A 63.71.8.109
smtpout.zixmail.net. 600 A 63.71.8.101
smtpout.zixmail.net. 600 A 63.71.8.102
Authority
zixmail.net. 600 NS ns03.zixcorp.com.
zixmail.net. 600 NS ns01.zixcorp.com.
zixmail.net. 600 NS ns02.zixcorp.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0