Question and response
Question
dig 1f1d93bf-outbound-2.mta.getcheckrecipient.com. A
Answer
1f1d93bf-outbound-2.mta.getcheckrecipient.com. 600 A 54.76.193.175
Authority
mta.getcheckrecipient.com. 172800 NS ns-1303.awsdns-34.org.
mta.getcheckrecipient.com. 172800 NS ns-171.awsdns-21.com.
mta.getcheckrecipient.com. 172800 NS ns-1861.awsdns-40.co.uk.
mta.getcheckrecipient.com. 172800 NS ns-972.awsdns-57.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0