![]() When an end user sends an email, they are actually querying a server. Mail servers work in conjunction with DNS servers. This lets a user access files from emails from any device, as well as lets them organize mail without downloading beforehand. IMAP Internet Message Access Protocol (IMAP) stores copies of messages on the server, rather than on a computer or device.Once a user downloads the mail message, it is removed from the server. POP3 Post Office Protocol, version 3 (POP3) is most commonly used for storing sent and received mail on local drives and/or servers.This protocol works with the Mail Transfer Agent (MTA) running on your mail server to ensure messages are sent to the proper address. SMPT Simple Mail Transfer Protocol (SMPT) is used for outgoing mail and is part of the TCP/IP application layer.Email runs on the following server types: The only difference is that the mail is delivered to electronic addresses rather than physical ones. Types of Mail ServersĪll emails are sent via mail servers, which are the equivalent of postal mail carriers. But before we get deeper into the DNS side of things, let’s take a quick look at mail servers. Technologies that help with email security also rely on DNS, such as DomainKeys Identified Mail (DKIM) and sender policy frameworks (SPF). ![]() Without DNS, email couldn’t function properly, which would be catastrophic for organizations that rely heavily on online correspondence. User ID at domain name = format tells mail servers who and where the email should be delivered to. They always include a user name or ID and a domain name: Otherwise, mail servers wouldn’t know where to deliver the “package.”Įmails follow the same format regardless of the email host. And just like a domain name, each email address needs to map to an IP address. Every email sent also generates a DNS lookup. In the above crash course, you learned the basics of DNS. Tip : Check out our Authoritative and Recursive DNS: What’s the Difference blog for a deeper dive into the DNS process. The authoritative server always holds the most up-to-date DNS information, and thus, provides the final answer for web requests. There are numerous factors that affect a query journey, but in most cases, the lookup process begins with a recursive resolver and ends with the authoritative nameserver for the requested website or application. This involves several DNS servers that are positioned around the globe. Any time a user enters a website into their browser, a DNS lookup is initiated and the query journey begins. This is how your device knows “where to go.” So in a sense, DNS is like GPS for the internet. The main function of DNS is to convert domain names into IP addresses. Without DNS, no one could find your website or application on the internet. DNS Crash Course: What Is It and How Does It WorkĪny device that connects to the web uses the domain name system (DNS)-this includes computers, phones, gaming systems, smart appliances, cars-you name it. In this resource, we’ll cover how DNS and email work together. Considering that email is a leading factor in customer acquisition and retention and a critical component for internal communication, it should be the opposite. One of the most overlooked and least discussed DNS topics is how the domain name system affects email and online communication.
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