DKIM DMARC SPF Email Instructions For Google And Yahoo Update

Securing Emails through Comprehensive Guide to DMARC, DKIM, and SPF Requirements for Gmail and Yahoo Mail

Mastering email compliance is essential in today’s digital communication landscape. This guide delves into DMARC, DKIM, and SPF protocols in cPanel, providing a roadmap for organizations to enhance email security.

These protocols are the foundation for authentication and deliverability, crucial in safeguarding against phishing, spoofing, and unauthorized access.

This comprehensive guide lays the groundwork for a deeper understanding of each protocol, offering practical insights for their implementation in the cPanel interface.

From configuring SPF for robust email authorization to understanding DKIM intricacies and creating effective DMARC policies, the guide equips users with knowledge and tools for navigating the evolving email compliance landscape.

Overview of DMARC, SPF and DKIM

DKIM, SPF, and DMARC join forces to keep you safe from online threats. Think of them as your email bodyguards.

DKIM (DomainKeys Identified Mail): This adds a unique signature to emails, connecting them to the sending domain. When your email arrives, servers check this signature against the domain’s records to ensure it’s real. DKIM ensures your message stays intact, making it tricky for cyber bad guys to mess with your emails and reducing the risk of sneaky phishing attacks.

SPF (Sender Policy Framework): Domain owners list their trusted mail servers in DNS records. When an email arrives, the server checks to confirm if the sending server is allowed for that domain. SPF acts like a shield, stopping bad guys from using a domain for phishing and making sure only the good servers send emails to that domain.

DMARC (Domain-based Message Authentication, Reporting & Conformance): Adds an extra layer of protection. Owners can set policies for emails that don’t pass authentication checks, quarantine, reject, or allow. DMARC even gives owners reports on email authentication failures, helping them strengthen their email security.

What Is DMARC And How Does It Work?

DMARC, or Domain-based Message Authentication, Reporting, & Conformance, smoothly connects the first two protocols by implementing a unified set of rules. It also links the sender’s domain name with the “From:” header information. DMARC improves how mail recipients report, providing more detailed insights.

These DMARC settings are stored in DMARC records, which may include instructions to send reports to domain administrators. These reports give administrators the information they need to adjust their DMARC policies. For example, administrators can use the reports to refine their email authentication settings if valid emails are mistakenly marked as spam.

What is SPF and How Does it Work?

SPF, or Sender Policy Framework, strengthens your DNS servers and controls who can send emails using your domain. It safeguards against domain spoofing, helping your mail server identify where messages originate. SPF has three main parts: a rule-setting policy framework, an authentication method, and specific email headers conveying this data.

Think of Sender Policy Framework (SPF) as a public employee directory for a domain, showing all authorized email servers. Just as an organization’s employee directory is accessible to confirm employment, SPF records detail the IP addresses of permitted email-sending servers, much like listing all employees. When mail servers get an email, they check it against the SPF record before delivering it to the recipient’s inbox.

What is DKIM and How Does it Work?

DKIM, or DomainKeys Identified Mail, is vital for ensuring the trustworthiness of your email content, confirming it hasn’t been changed or compromised. Using DKIM, you enhance email security, letting recipients guarantee that the content is from your domain and hasn’t been altered.

DKIM utilizes public key cryptography. The domain’s public key is stored in a DKIM record, accessible for mail servers receiving emails from that domain. The sender safeguards the private key, using it to sign the email’s header. When mail servers receive the email, they can confirm using the sender’s private key by applying the public key retrieved from the DKIM record.

Methods of Email Authentication and Protection using DMARC, SPF, and DKIM

Now that we understand DKIM, DMARC, and SPF better, let’s see how to use them. Implementing these protocols is like building a solid defense for your email domain. The layers of protection to form a secure barrier against unauthorized access and malicious activities.

  • Create new DNS records, especially a DNS TXT record for DKIM and DMARC, and manage these records efficiently
  • Set up the hostname
  • Ideally, use an all-in-one tool for a smoother setup
  1. Set up DKIM


  • Add the public key to the domain’s DNS settings as a TXT record
  • Configure DKIM settings in your email service provider or admin console
  • Verify the DKIM setup
  1. DMARC Configuration


  • Gather all IP addresses used for sending emails from your domain
  • Create an SPF record listing these authorized IPs
  • Publish this record in your domain’s DNS

3.SPF Records Creation


  • Collect the IP addresses for sending emails
  • Make a list in the SPF record
  • Could you share it in your domain’s DNS

Why do you need DMARC, SPF, and DKIM, and How Do they protect you as a user?

Phishing and email spam pose significant risks for hackers to infiltrate networks. Clicking on a malicious email attachment by even one user can jeopardize an entire enterprise, leading to issues like ransomware, crypto-jacking scripts, data leaks, or privilege escalation exploits.

DMARC, DKIM, and SPF are three email authentication methods working together to block spammers, phishers, and unauthorized senders from using a domain they don’t own. Comparatively, DKIM and SPF act like a business license or a doctor’s degree on an office wall, showcasing legitimacy.

If domains need to set up SPF, DKIM, and DMARC correctly, their emails might be labeled as spam or not delivered. They also face the risk of spammers impersonating them.

The Advantage of Combining DKIM, DMARC and SPF

All three protocols significantly improve cold email deliverability, reducing the risk of spam or blocking. DKIM, DMARC, and SPF authenticate and verify emails. Together, they ensure legitimate emails reach inboxes, minimizing the chance of being marked as spam or rejected. This combination also protects against phishing and spoofing.

  • DKIM verifies the sender’s identity through a digital signature
  • SPF identifies authorized servers for sending domain emails
  • DMARC prevents email spoofing and phishing
  • DKIM prevents spoofing by digitally signing outgoing messages
  • DMARC reduces attempts of direct-domain spoofing
  • SPF ensures emails only come from authorized IP addresses linked to your domain.

Now, are you ready for this? Google and Yahoo’s New DMARC Policy and Setup Requirements

If you use Gmail or Yahoo, you’re likely familiar with the clutter caused by unwanted and potentially fraudulent emails in your inbox. The good news is that Google and Yahoo are working to address this issue. However, if your company emails Google and Yahoo users, you may have tasks to complete within a limited timeframe.

Starting February 2024, Gmail will require email authentication for messages sent to Gmail accounts. Bulk senders over 5,000 emails daily to Gmail accounts have additional authentication requirements.

This includes having a DMARC policy, ensuring SPF and DKIM alignment, and making unsubscribing easy (one-click unsubscribe). Google’s detailed Email Sender Guidelines can be found here. Yahoo is implementing similar requirements, mandating strong email authentication by early 2024 to combat malicious messages and reduce low-value emails in users’ inboxes.

Who will be impacted by these new requirements?

If you send over 5,000 messages each day to major email providers, starting February 2024, your email domain needs a DMARC policy in your DNS. These messages must pass DMARC Alignment for delivery. This also includes messages sent by third-party email service providers like Constant Contact and MailChimp, using your email domain for your organization.

What are the requirements of Gmail and Yahoo Mail?

Google and Yahoo have introduced new email requirements divided into two categories:

  1. For All Senders:
  • Email Authentication:It is essential to prevent cyber criminals from sending emails pretending to be from your organization and exploiting domains for malicious attacks.
  • SPF (Sender Policy Framework):A protocol preventing email spoofing in phishing attacks, allowing mail servers to verify emails from authorized IP addresses.
  • DKIM (DomainKeys Identified Mail):Let organizations take responsibility for messages by signing them for verification by mailbox providers.
  • Low Spam Rates:If recipients report your messages as spam above 0.3%, they may be blocked or sent to spam folders.
  1. For Senders of Over 5,000 Messages/Day:
  • SPF and DKIM Implementation:Mandatory for companies sending to Gmail or Yahoo.
  • DMARC Policy: Required for Domain-based Message Authentication, Reporting, and Conformance, offering domain-level protection against phishing and other attacks.
  • DMARC Alignment:Messages must align the Envelope and Header From domains or DKIM and Header From domains.
  • One-Click Unsubscribe:Messages must have List-Unsubscribe headers and a visible unsubscribe link for subscribed messages. Unsubscribe actions must be possible within two days for users who request them.

What happens to you or your business if you miss the deadline?

If your business relies on email to communicate with your customers and you don’t implement email authentication, this will significantly impact message delivery to Gmail and Yahoo accounts. For those sending over 5,000 emails daily without SPF and DKIM or lacking a DMARC policy, the consequences on your business will be even more severe with increased non-deliveries.

What is the implication of this requirement to the future?

This update is a positive move by Google and Yahoo, hinting at more changes. Emails might make DMARC enforcement mandatory for accurate email delivery.

While many businesses have adopted DMARC, many still need to enforce it with policies. This suggests that the email system may need to be fully prepared for Gmail, Yahoo Mail, or other providers to implement strict DMARC requirements.

The trend is clear. This update shows a shift from recommending to requiring SPF, DKIM, DMARC, and other best practices for sending. Once emails mandate any form of DMARC record, it’s only a matter of time before their suggestion for senders to set their policy becomes another requirement. Take the necessary steps to meet all new requirements and protect your domain and brand.


DKIM, DMARC, and SPF are ways to improve email security. These protocols verify the sender, keep messages intact, and set rules for unauthenticated emails. While setting them up might seem challenging, the benefits of better email delivery, protection from phishing and spoofing, and compliance with ISP policies make it a valuable investment. Start enhancing your email security today.




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