Question and response
Question
dig imap.vnptemail.vn. NS
Answer
imap.vnptemail.vn. 5 CNAME mail.vnptemail.vn.
Authority
vnptemail.vn. 1065 SOA ns1.vdconline.vn. vdconline.tld. 2026021164 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0