Question and response
Question
dig mx.core1.sfdc-hvhps.mta.salesforce.com. A
Answer
mx.core1.sfdc-hvhps.mta.salesforce.com. 300 A 13.228.127.21
mx.core1.sfdc-hvhps.mta.salesforce.com. 300 A 18.142.109.36
mx.core1.sfdc-hvhps.mta.salesforce.com. 300 A 13.213.216.24
Authority
sfdc-hvhps.mta.salesforce.com. 86400 NS dns01.salesforce.com.
sfdc-hvhps.mta.salesforce.com. 86400 NS dns02.salesforce.com.
sfdc-hvhps.mta.salesforce.com. 86400 NS dns03.salesforce.com.
sfdc-hvhps.mta.salesforce.com. 86400 NS dns04.salesforce.com.
sfdc-hvhps.mta.salesforce.com. 86400 NS dns05.salesforce.com.
sfdc-hvhps.mta.salesforce.com. 86400 NS dns06.salesforce.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0