Question and response
Question
dig cluster6.us.messagelabs.com. MX
Answer
cluster6.us.messagelabs.com. 60 MX 10 mail903.messagelabs.com.
cluster6.us.messagelabs.com. 60 MX 10 mail928.messagelabs.com.
cluster6.us.messagelabs.com. 60 MX 10 mail944.messagelabs.com.
Authority
messagelabs.com. 180 NS ns-1296.awsdns-34.org.
messagelabs.com. 180 NS ns-1714.awsdns-22.co.uk.
messagelabs.com. 180 NS ns-453.awsdns-56.com.
messagelabs.com. 180 NS ns-520.awsdns-01.net.
Additional
mail903.messagelabs.com. 900 A 67.219.246.217
mail928.messagelabs.com. 900 A 67.219.247.196
mail944.messagelabs.com. 900 A 67.219.250.213
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0