Question and response
Question
dig spf.messagelabs.com. TXT
Answer
spf.messagelabs.com. 3600 TXT "v=spf1 include:nets1.spf.messagelabs.com include:nets2.spf.messagelabs.com ~all"
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
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0