Question and response
Question
dig mx.core1.sfdc-ei37dk.mta.salesforce.com. A
Answer
mx.core1.sfdc-ei37dk.mta.salesforce.com. 300 A 16.62.187.55
mx.core1.sfdc-ei37dk.mta.salesforce.com. 300 A 16.62.23.249
mx.core1.sfdc-ei37dk.mta.salesforce.com. 300 A 16.62.26.229
Authority
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns01.salesforce.com.
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns02.salesforce.com.
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns03.salesforce.com.
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns04.salesforce.com.
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns05.salesforce.com.
sfdc-ei37dk.mta.salesforce.com. 86400 NS dns06.salesforce.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0