Question and response
Question
dig cluster6.eu.messagelabs.com. MX
Answer
cluster6.eu.messagelabs.com. 60 MX 10 mail834.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail839.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail858.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail859.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail860.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail874.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail876.messagelabs.com.
cluster6.eu.messagelabs.com. 60 MX 10 mail879.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
mail834.messagelabs.com. 900 A 85.158.142.210
mail839.messagelabs.com. 900 A 85.158.142.215
mail858.messagelabs.com. 900 A 195.245.230.200
mail859.messagelabs.com. 900 A 195.245.230.201
mail860.messagelabs.com. 900 A 195.245.230.202
mail874.messagelabs.com. 900 A 195.245.231.69
mail876.messagelabs.com. 900 A 195.245.231.72
mail879.messagelabs.com. 900 A 195.245.231.75
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0