salesforce0320192._domainkey.axcient.com has no NS records.
NS records for this zone are defined at axcient.com.
NS records for this zone are defined at axcient.com.
Question and response
Question
dig salesforce0320192.1b1c3z.custdkim.salesforce.com. NS
Answer
The response has no answer records.
Authority
custdkim.salesforce.com. 30 SOA mastername.salesforce.com. hostmaster.salesforce.com. 2041237497 1800 900 2592000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0