Simply click on a chapter below to jump to any section.

Chapter 1

What is DKIM?

What is DKIM

DKIM, short for DomainKeys Identified Mail, is an authentication mechanism that allows the receiving mail server to check if a message has been altered in transit using an encrypted signature that is left by the sending server and checked by the recipient server.

Learn More about DKIM

DKIM is an important part of the Authentication topic. It plays a key role in your ability to establish a strong DMARC policy.

Chapter 2

DKIM and Deliverability

Does Implementing DKIM Improve My Sender Reputation?

Mailbox providers use various means to tie your domain and IP to a reputation as a way to better regulate the quality of mail going through their platforms to end users. When DKIM is applied, you are giving mailbox providers one way to further trust your domain as a high-quality sender and allow placement of your messages in the recipient’s inbox. If you do not use any type of authentication, mailbox providers are less likely to trust the mail being sent from your domain and will likely forward it directly to the recipient’s junk or spam folder. As a legitimate marketing or transactional email sender, it is very important to apply both DKIM and SPF authentication and set up a DMARC policy. This will give you the most value and brand protection from your email efforts.

Why You Should Use DKIM

DKIM (along with SPF) is an essential email authentication protocol that should be implemented by any businesses or brands sending marketing and transactional email. Not only does using DKIM authentication improve your chances of hitting the inbox, it helps protect your brand and secure your email.

dkim checklist

Chapter 3

How Does DKIM Work?

What is a DKIM Record

DKIM authentication is based in public/private key pair cryptography. Sometimes the public portion placed into DNS for a given DKIM key pair is referred to as a DKIM record. There is no single central DNS location for DKIM public key records as their location in DNS is determined by a selector variable.

Learn More About DKIM Records

What is DKIM Alignment

Simply put, DKIM alignment happens when the domain of the DKIM signature matches the domain in the from address. So if an email service like SocketLabs signs all of their messages with a DKIM signature, alignment does not happen until the brand sending the messages signs them with their own domain.

Learn More About DKIM Alignment

What is a Domain Key

DKIM works using a key pair. One of the keys is public and one of the keys is private. The public key is published in the DNS and the private key is configured in the mail server. To understand how these keys work watch this video about the history and the technology at play behind public key cryptography.

Learn More About Domain Keys

Looking to Learn More About Setting Up SPF and DKIM in Your DNS? Check Out Our Help Center!

Chapter 4

Email Authentication: DKIM Vs. SPF Vs. DMARC

dkim vs spf vs dmarc

dkim vs spf vs dmarc

Important SocketLabs Authentication Tools & Resources!


What Sets SocketLabs Apart!

We monitor changes in ISP authentication practices and make ongoing adjustments to our protocols so clients always have the latest authentication methods at their disposal. All of this expertise is applied “behind the scenes” so clients just send their email, and then simply watch it hit the inbox.

Authentication is only part of the many steps we take to ensure top deliverability for your emails.
Contact us today or signup for a free account to try it out for yourself. You’ll be sending authenticated email in minutes!

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