Email Deliverability 101: FYI about DNS (and subdomains)

Editor’s Note: Today we’re starting a new blog series—Deliverability 101. We brought you the 250ok Deliverability Guide earlier this summer, and we realized we were only scratching the surface. So we’re barrelling head-first into the jungle, chopping away at topics that confuse, bewilder and otherwise agonize those learning how to send good email. We’ll post a new topic every Wednesday, and each will complement our Deliverability Guide. We hope you enjoy the ride.

We’ll start at the very ground floor: Domain Name System (DNS). DNS is one of the core components of the internet, and without it, you likely wouldn’t be reading this information right now. DNS operates as a translation agent between human-readable words, domain names, and machine-operated internet protocol addresses (IP addresses). But because life can’t be easy, it’s more complicated than just being a translation service. It also allows for the distinction of specific services that might operate on the same server.

How does DNS work?
The DNS translates plain text requests for information into IP addresses for computers to locate, access, and uses information. For example, when a user asks to access, the web browser will ask (via DNS), “Where do I find this website?” DNS will respond, “At the following IP address:”

DNS contains....

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