$ORIGIN simple.com.
$TTL 300
@                IN SOA   ns3.serverfault.com. sysadmin.stackoverflow.com. 2020022300 3600 600 604800 1440
           172800 IN NS   ns-1313.awsdns-36.org.
           172800 IN NS   ns-736.awsdns-28.net.
           172800 IN NS   ns-cloud-c1.googledomains.com.
           172800 IN NS   ns-cloud-c2.googledomains.com.
                 IN MX    1 aspmx.l.google.com.
                 IN MX    5 alt1.aspmx.l.google.com.
                 IN MX    5 alt2.aspmx.l.google.com.
                 IN MX    10 alt3.aspmx.l.google.com.
                 IN MX    10 alt4.aspmx.l.google.com.
                 IN TXT   "google-site-verification=O54a_pYHGr4EB8iLoGFgX8OTZ1DkP1KWnOLpx0YCazI"
                 IN TXT   "v=spf1 mx include:mktomail.com ~all"
m1._domainkey    IN TXT   "v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCZfEV2C82eJ4OA3Mslz4C6msjYYalg1eUcHeJQ//QM1hOZSvn4qz+hSKGi7jwNDqsZNzM8vCt2+XzdDYL3JddwUEhoDsIsZsJW0qzIVVLLWCg6TLNS3FpVyjc171o94dpoHFekfswWDoEwFQ03Woq2jchYWBrbUf7MMcdEj/EQqwIDAQAB"
_sip._tcp        IN SRV   10 60 5060 bigbox.example.com.
dev              IN CNAME stackoverflowsandbox2.mktoweb.com.
dev-email        IN CNAME mkto-sj310056.com.
m1._domainkey.dev-email IN TXT "v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCIBezZ2Gc+/3PghWk+YOE6T9HdwgUTMTR0Fne2i51MNN9Qs7AqDitVdG/949iDbI2fPNZSnKtOcnlLYwvve9MhMAMI1nZ26ILhgaBJi2BMZQpGFlO4ucuo/Uj4DPZ5Ge/NZHCX0CRhAhR5sRmL2OffNcFXFrymzUuz4KzI/NyUiwIDAQAB"
email            IN CNAME mkto-sj280138.com.
info             IN CNAME stackoverflow.mktoweb.com.