DNSSEC was designed to protect applications (and caching resolvers serving those applications) from using forged or manipulated DNS data, such as that created by DNS cache poisoning.

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By checking the digital signature, a DNS resolver is able to check if the information is identical (i.e.

unmodified and complete) to the information published by the zone owner and served on an authoritative DNS server.

In this post, I'll show you how to get up an running with a DNS server quickly and easily.

After you've created your Azure network (outside the scope of this post), you can feel free to divide your network into logical subnets.

When you add your domain to Office 365, typically your domain's MX record is updated (by you or Office 365) to point to Office 365, and ALL email sent to that domain will start coming to Office 365.

Make sure you've created mailboxes in Office 365 for everyone who has email on your domain BEFORE you change the MX record.It is a set of extensions to DNS which provide to DNS clients (resolvers) origin authentication of DNS data, authenticated denial of existence, and data integrity, but not availability or confidentiality.The original design of the Domain Name System (DNS) did not include any security details; instead, it was designed to be a scalable distributed system.What if you don't want to move email for everyone on your domain to Office 365?You can take steps to pilot Office 365 with just a few email addresses instead.While protecting IP addresses is the immediate concern for many users, DNSSEC can protect any data published in the DNS, including text records (TXT), mail exchange records (MX), and can be used to bootstrap other security systems that publish references to cryptographic certificates stored in the DNS such as Certificate Records (CERT records, RFC 4398), SSH fingerprints (SSHFP, RFC 4255), IPSec public keys (IPSECKEY, RFC 4025), and TLS Trust Anchors (TLSA, RFC 6698).