Informative infographic about DKIM Authentication Requirement by SIRIUS, highlighting the importance of email security for businesses. Features icons representing emails, the internet, and location, alongside a computer screen and mailbox, all set against a vibrant blue background.

DKIM Authentication Requirement: A Must-Read for Businesses Using Email

Email is a powerful and necessary tool for businesses to communicate with their customers, promote products or services, and build brand loyalty. However, most major email providers including Gmail and Yahoo are beginning to lock down the security of emails being sent to their servers starting Q1 of 2024, so now! Implementing secure email authentication protocols like DKIM and DMARC is crucial to protect your brand’s reputation and ensure your messages reach your audience’s inbox, not their spam folder. Beginning this year, the major providers will no longer allow emails to be received to free email accounts, so if you interact with anyone that uses Gmail or Yahoo, you must enforce DKIM and DMARC on your email service provider today.

The Shift Toward Greater Email Security

Email providers are now enforcing the implementation of DKIM (DomainKeys Identified Mail) authentication for newsletter senders. This change aims to enhance the security and credibility of emails, fostering a safer digital environment for both senders and recipients.

To combat the ever-present threats of spam, phishing, and other malicious activities, major email service providers like Gmail, Yahoo, and others have introduced stricter regulations. For instance, Gmail now requires that senders sending to Gmail accounts must utilize DKIM authentication. This trend is not limited to Gmail alone; other providers are either already enforcing DKIM or are in the process of making it a standard practice for high-volume senders.

How DKIM Works to Secure Your Emails

DKIM is a technical standard that helps protect email senders and recipients from various forms of email abuse, including email spoofing and phishing attacks. It allows the receiver to check that an email claimed to have come from a specific domain was indeed authorized by the owner of that domain. This is achieved through a digital signature embedded in the email’s header. The receiving email server uses this signature to verify the email’s authenticity and integrity, ensuring that it has not been tampered with during transit.

What is DKIM?

When an email is sent, the sending server attaches a DKIM signature to the message header. This signature is a digital fingerprint, unique to the email and the sending domain. The receiving mail server then looks up the sender’s DKIM record in the domain’s DNS records to retrieve the public key. This key is used to decrypt the signature and verify the integrity of the email. If the verification is successful, the email is considered authentic.

Setting Up DKIM for Your Business

The process of setting up DKIM involves several steps:

  1. Generate a DKIM Key Pair: This consists of a public key and a private key. The private key is used to create the digital signature, while the public key is used by receiving servers to verify the signature.
    1. If you are using Microsoft 365, use this guide from Microsoft directly.
  2. Publish the Public Key: The public key is published in your domain’s DNS records, allowing receiving servers to access it for verification purposes.
  3. Configure Your Email Server: Your email server needs to be configured to sign outgoing emails with the private key.

Once DKIM is set up, your emails will carry a DKIM signature in their headers, which receiving servers can use to verify their authenticity.

Benefits of Implementing DKIM for Your Business

  1. Improved Email Deliverability: Emails authenticated with DKIM are less likely to be marked as spam, ensuring better inbox placement.
  2. Enhanced Sender Reputation: DKIM helps build trust with email service providers, improving your sender reputation over time.
  3. Protection Against Email Spoofing: By verifying that emails are genuinely from your domain, DKIM helps protect your brand from being used in phishing attacks.

Beyond DKIM: Comprehensive Email Security Practices

While DKIM is a crucial component of email security, it’s not the only measure you should take. To further secure your newsletters and maintain the trust of your subscribers, consider the following:

  1. Consent is Key: Only send emails to individuals who have explicitly agreed to receive them. Utilize a Double Opt-In process to confirm their consent.
  2. Easy Unsubscribe: Ensure that your emails include a visible unsubscribe link, allowing recipients to opt out easily if they choose to do so.
  3. Additional Authentication: Besides DKIM, implement SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting, and Conformance) to bolster your email authentication framework.

The Role of SPF and DMARC in Email Authentication

SPF and DMARC are additional authentication methods that work alongside DKIM to provide a comprehensive email security solution:

  • SPF (Sender Policy Framework): SPF allows domain owners to specify which IP addresses are authorized to send emails on behalf of their domain. When an email is received, the SPF record is checked to ensure that the email comes from an approved server.
  • DMARC (Domain-based Message Authentication, Reporting, and Conformance): DMARC builds on SPF and DKIM by providing a policy that specifies how receiving servers should handle emails that fail SPF or DKIM checks. It also provides a reporting mechanism that sends reports back to the domain owner about the success or failure of email authentication.

Common Challenges and Solutions in DKIM Implementation

Implementing DKIM can come with its own set of challenges, especially for businesses that are new to email authentication. Some common issues include incorrect DNS record setup, managing multiple domains, and ensuring compatibility with existing email infrastructure. To overcome these challenges, it’s important to:

  1. Work with Experienced Providers: Partner with email service providers or IT professionals who have experience in setting up DKIM and other email authentication protocols.
  2. Regularly Monitor and Update: Keep an eye on your email authentication status and update your DKIM records as needed to ensure continued effectiveness.
  3. Educate Your Team: Ensure that your marketing and IT teams are aware of the importance of DKIM and understand the basics of how it works.

The Future of Email Authentication

As email threats continue to evolve, so too will the methods for combating them. The adoption of DKIM, SPF, and DMARC is just the beginning. Future advancements in email authentication may involve more sophisticated techniques, such as using machine learning algorithms to detect forged sender addresses or incorporating blockchain technology to ensure the immutability of email records. Staying informed about these developments and adapting your email security practices accordingly will be essential for maintaining the trust and safety of your email communications.


For business owners utilizing newsletters and marketing emails, implementing DKIM is a critical step in safeguarding your email communication and maintaining the trust of your customers. By ensuring the authenticity and integrity of your emails, you not only protect your brand but also enhance the effectiveness of your email marketing campaigns. Start taking control of your email security today and give your business the protection it deserves.

Staying Ahead in Email Security: What’s Next?

Staying informed about the latest trends and advancements in email authentication and all things IT for your business in Phoenix, AZ can help you stay one step ahead. Sirius Office Solutions offers comprehensive email security services to ensure your marketing emails are protected and delivered successfully. Contact us today to learn how we can help safeguard your email communication and business technology overall.