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Why is DMARC failing? How to fix DMARC Failure in 2023?

DMARC fail for your messages is a cause for concern if you are an organization heavily reliant on emails for both external and internal communications. There are methods as well as tools you can use online (for free) to stop DMARC fail for your emails.

In this article, we would be carefully debunking the top 6 reasons for DMARC failure and how you can mitigate them for improved deliverability.

Before we head over to why is DMARC failing, let’s see what it is and how it helps you:

DMARC is a key activity in your email authentication policy to help prevent forged “spoofed” emails from passing transactional spam filters. But, it’s just one pillar of an overall anti-spam program, and not all DMARC reports are created equal. Some will tell you the exact action mail receivers took on each message, and others will only tell you if a message was successful or not. Understanding why a message failed is as important as knowing whether it did.

Common Reasons that can cause DMARC fail

Identifying why is DMARC failing can be complicated. However I will go over some typical reasons, and the factors that contribute to them, so that you as the domain owner can work towards rectifying the problem more promptly.

DMARC Alignment Failures

DMARC makes use of domain alignment to authenticate your emails. This means that DMARC verifies whether the domain mentioned in the From address (in the visible header) is authentic by matching it against the domain mentioned in the hidden Return-path header (for SPF) and DKIM signature header (for DKIM). If either matches, the email passes DMARC, or else DMARC fails.

Hence, if your emails are failing DMARC it can be a case of domain misalignment. That is neither SPF nor DKIM identifiers are aligning and the email is appearing to be sent from an unauthorized source. This however is just one of the reasons why is DMARC failing.

DMARC Alignment Mode 

Your protocol alignment mode also plays a huge role in your messages passing or failing DMARC. You can choose from the following alignment modes for SPF authentication:

  • Relaxed: This signifies that if the domain in the Return-path header and the domain in the From header is simply an organizational match, even then SPF will pass.
  • Strict: This signifies that only if the domain in the Return-path header and the domain in the From header is an exact match, only then SPF will pass.

You can choose from the following alignment modes for DKIM authentication:

  • Relaxed: This signifies that if the domain in the DKIM signature and the domain in the From header is simply an organizational match, even then DKIM will pass.
  • Strict: This signifies that only if the domain in the DKIM signature and the domain in the From header is an exact match, only then DKIM will pass.

Note that for emails to pass DMARC authentication, either SPF or DKIM needs to align.  

Not Setting Up Your DKIM Signature 

A very common case in which your DMARC may be failing is that you haven’t specified a DKIM signature for your domain. In such cases, your email exchange service provider assigns a default DKIM signature to your outbound emails that don’t align with the domain in your From header. The receiving MTA fails to align the two domains, and hence, DKIM and DMARC fail for your message (if your messages are aligned against both SPF and DKIM).

Not Adding Sending Sources to Your DNS 

It is important to note that when you set up DMARC for your domain, receiving MTAs perform DNS queries to authorize your sending sources. This means that unless you have all your authorized sending sources listed in your domain’s DNS, your emails will fail DMARC for those sources that are not listed since the receiver would not be able to find them in your DNS. Hence, to ensure that your legitimate emails are always delivered be sure to make entries on all your authorized third-party email vendors that are authorized to send emails on behalf of your domain, in your DNS.

In Case of Email Forwarding

During email forwarding, the email passes through an intermediary server before it ultimately gets delivered to the receiving server. During email forwarding, the SPF check fails since the IP address of the intermediary server doesn’t match that of the sending server, and this new IP address is usually not included within the original server’s SPF record. On the contrary, forwarding emails usually don’t impact DKIM email authentication, unless the intermediary server or the forwarding entity makes certain alterations in the content of the message.

As we know that SPF inevitably fails during email forwarding, if in case the sending source is DKIM neutral and solely relies on SPF for validation, the forwarded email will be rendered illegitimate during DMARC authentication. To resolve this issue, you should immediately opt for full DMARC compliance at your organization by aligning and authenticating all outgoing messages against both SPF and DKIM, as for an email to pass DMARC authentication, the email would be required to pass either SPF or DKIM authentication and alignment.

Your Domain is Being Spoofed

If you have your DMARC, SPF, and DKIM protocols properly configured for your domain, with your policies at enforcement and valid error-free records, and the problem isn’t either of the above-mentioned cases, then the most probable reason why your emails are failing DMARC is that your domain is being spoofed or forged. This is when impersonators and threat actors try to send emails that appear to be coming from your domain using a malicious IP address.

Recent email fraud statistics have concluded that email spoofing cases are on the rise in recent times and are a very big threat to your organization’s reputation. In such cases, if you have DMARC implemented on a reject policy, it will fail and the spoofed email will not be delivered to your recipient’s inbox. Hence domain spoofing can be the answer to why is DMARC failing in most cases.

Why does DMARC fail for third-party mailbox providers? (Gmail, Mailchimp, Sendgrid, etc)

If you are using external mailbox providers to send emails on your behalf, you need to enable DMARC, SPF, and/or DKIM for them. You can do so by either contacting them and asking them to handle implementation for you, or you can take matters into your own hands and manually activate the protocols. To do so you need to have access to your account portal hosted on each of these platforms (as an admin).

If your Gmail messages are failing DMARC, hover over to your domain’s SPF record and check whether you have included _spf.google.com in it. If not, this may be a reason why receiving servers are failing to identify Gmail as your authorized sending source. The same applies to your emails sent from Mailchimp, Sendgrid, and others.

How to fix DMARC failure?

To fix DMARC failure,  we recommend that you sign up with our free DMARC Analyzer and start your journey of DMARC reporting and monitoring.

#Step 1: With a none policy, you can begin by monitoring your domain with DMARC (RUA) Aggregate Reports and keep a close eye on your inbound and outbound emails, this will help you respond to any unwanted delivery issues

#Step 2: After that, we help you shift to an enforced policy that would ultimately aid you in gaining immunity against domain spoofing and phishing attacks

#Step 3: Takedown malicious IP addresses and report them directly from the PowerDMARC platform to evade future impersonation attacks, with the help of our Threat Intelligence engine

#Step 4: Enable DMARC (RUF) Forensic reports to gain detailed information about cases where your emails have failed DMARC so that you can get to the root of the problem and fix it faster

How to tackle messages that fail DMARC?

Note that an email may fail DMARC due to usual circumstances like a spoofing threat, failing alignment for a) DKIM only b) SPF only c) both. If it fails both, your message will now be deemed unauthorized. You can configure a suitable DMARC policy to instruct receivers on how to respond to these emails.

Hope we could address the issue of why is DMARC failing for your domain and provide a solution around how to fix the problem easily. To prevent domain spoofing and monitor your email flow with PowerDMARC, today!

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What is DMARC Vulnerability?

DMARC records when configured in the right way can benefit you in more ways than one. It is a new realm in email security that offers domain owners a wealth of information about their email sending sources and performance. DMARC vulnerability refers to very common errors that users make while implementing the protocol or enforcing it. 

Vulnerabilities in your email authentication system can range from simple errors like wrong syntax to more complex errors. Either way, unless you troubleshoot these issues and set up your protocol correctly, it may invalidate your email security efforts. 

Before we analyze the possible vulnerabilities that you may encounter on your email authentication journey, let’s do a quick run-through of a few basic concepts. They are:

  1. What is email authentication?
  2. How does DMARC authenticate your emails?
  3. The impact of DMARC vulnerabilities on your message deliverability

What is Email Authentication?

Cybercriminals can extract financial benefits by intercepting email communications or using social engineering to defraud unsuspecting victims. 

Email authentication refers to specific verification systems domain owners can configure to establish the legitimacy of emails sent from their domain. This can be done by digital signatures placed in the message body, verification of Return-path addresses, and/or identifier alignment. 

Once the authentication checks confirm the legitimacy of the message, the email gets dropped into the receiver’s inbox. 

How does DMARC authenticate your emails?

When a company sends a message to its users, the email travels from the sending server to the receiving server to complete its deliverability journey. This email has a Mail From: header which is the visible header displaying the email address the email has been sent from and a Return-path header which is a hidden header containing the Return-path address.

An attacker can spoof the company domain to send emails from the same domain name, however, it is much more difficult for them to mask the Return-path address. 

Let’s take a look at this suspicious email:

While the email address associated with the message seems to be coming from [email protected] which feels genuine, on inspecting the Return-path address it can be quickly established that the bounce address is completely unrelated to company.com and was sent from an unknown domain. 

This bounce address (aka Return-path address) is used by email receiving servers to look up a sender’s SPF record while verifying DMARC. If the sender’s DNS contains the IP address that matches the IP of the sent email, SPF and subsequently DMARC passes for it, else it fails. Now according to the DMARC policy configured by the sending domain, the message may get rejected, quarantined, or delivered. 

Alternatively, DMARC may also check for DKIM identifier alignment to verify an email’s authenticity.

The impact of DMARC vulnerabilities on your message deliverability

The probability of your messages being delivered to your clients is hugely dependent on how accurately you have configured your protocol. Existing vulnerabilities in your organization’s email security posture can weaken the chances of your messages being delivered. 

Certain clear indications of loopholes in your DMARC authentication system are as follows:

  • Problems in email deliverability
  • Legitimate messages being marked as spam 
  • DMARC error prompts while using online tools 

Types of DMARC Vulnerabilities 

DMARC vulnerability #1: Syntactical errors in DNS records

A DMARC record is a TXT record with mechanisms separated by semicolons that specify certain instructions to email receiving MTAs. Given below is an example: 

v=DMARC1; p=reject; rua=mailto:[email protected]; pct=100;

Small details such as the mechanism separators (;) play an important role in determining if your record is valid, and thus, cannot be overlooked. This is why to do away with the guesswork, we recommend that you use our free DMARC record generator tool to create an accurate TXT record for your domain.

DMARC vulnerability #2: No DMARC record found / DMARC record missing vulnerability

Domain owners may often come across a message while using online tools, prompting that their domain is missing a DMARC record. This can occur if you don’t have a valid record published on your DNS. 

DMARC helps you protect your domain and organization against a wide range of attacks including phishing and direct domain spoofing. Living in a digital world with threat actors trying to intercept email communications every step of the way, we need to exercise caution and implement preventive measures to stop these attacks. DMARC aids in that process to promote a safer email environment.

We have covered a detailed article on fixing the no DMARC record found vulnerability which you can refer to by clicking on the link.

DMARC vulnerability #3: Policy at none: monitoring only

A frequent misapprehension among users is that a DMARC policy at p=none is enough to protect their domain against attacks. In reality, only an enforced policy of reject/quarantine can help you build up your defenses against spoofing. 

A relaxed policy can however be fruitful if you only want to monitor your email channels, without enforcing protection. It is however recommended that you make a quick shift to p=reject once you are confident. 

We have placed this under the DMARC vulnerability category based on the criterion that most users implement DMARC to gain a higher degree of protection against attacks. Therefore, a policy with zero enforcement can be of no value to them.

DMARC vulnerability #4: DMARC policy not enabled

Similar to the previous vulnerability, this error prompt can often be a result of the lack of an enforced policy for DMARC. If you have set up your domain with a none policy, making it vulnerable to phishing attacks, it is a recommended practice to shift to p=reject/quarantine as soon as possible. To do so, you need only make a small tweak to your existing DNS record to modify and upgrade your policy mode. 

We have covered a detailed document on how to resolve the DMARC policy not enabled error which you can view by clicking on the link.

Troubleshooting DMARC vulnerabilities in real-time

To fix these issues you can consider implementing the following steps at your organization:

  1. Make a list of all your authorized email sending sources and configure a DMARC monitoring tool to track them daily or from time to time
  2. Have a discussion with your email vendors to substantiate whether they support email authentication practices
  3. Learn about SPF, DKIM, and DMARC in detail before you move on to the next steps.
  4. Make sure your SPF record is devoid of SPF Permerror by implementing an SPF flattening tool
  5. Make your protocol implementation process seamless with expert insights and guidance from DMARC specialists by signing up for a free DMARC analyzer. This can help you shift to p=reject safely with real-time vulnerability and attack detection.

Protecting your domain is one of the primitive steps towards preserving your reputation and upholding your credibility. Make email security a part of your security posture today!

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Using DMARC to Secure Your Inactive/Parked Domains

It is critical that any business using emails to communicate with their customers becomes DMARC compliant in order to protect the fidelity and privacy of their client’s information. However, a common mistake that organizations often end up making is securing their local/active domains, while completely ignoring the security of their parked domains.

DMARC is an email authentication protocol designed to prevent spammers from impersonating the senders of legitimate emails. Using DMARC provides real value. Not only is it an industry standard, but by implementing it you earn trust and respect from your customers, gain control of your domain from cybercriminals, and increase deliverability and message consistency.

What are Parked Domains?

Parked domains are webmaster-friendly aliases that streamline and promote your online presence. Basically, it refers to the practice of using an alternative domain name (i.e., parked) for advertising or administrative purposes. Parked domains are a great way to create additional brand equity for your business. While Parked Domains are domains that have been registered on purpose, they are not necessarily used to send emails or rank in search engines.

A parked domain is usually just an empty shell with no substance. Such domains often remain dormant and aren’t used for any interactive purposes like sending emails. Often purchased years ago, it is only natural for large enterprises that make use of several domains to carry out daily activities, to forget about them. So naturally, you might be thinking about whether securing your parked domains is even necessary in the first place? The answer is, yes! The low domain security of your inactive domains can make them an easier target for attackers. DMARC steps in to help you secure these parked domains, preventing them from being used for malicious ends.

How Can You Leverage DMARC to Secure Your Parked Domains?

In general, ISPs will treat domain names, especially parked domains, that lack a DMARC record with a low level of scrutiny. This means that these domains may not be protected well against spam and abuse. By skipping this step, you might be protecting your main domain with 100% DMARC enforcement with a policy of p=reject, all while remaining vulnerable on your parked domains. By setting up a set of DNS records for inactive domains, you can help prevent them from being used for phishing or malware distribution.

For every business owner out there, your company’s reputation should be of utmost importance to you. Therefore, when it comes to opting for email authentication, it should be for every domain you own. What’s even better is that implementing DMARC only requires you to publish a couple of records in your DNS.

However, before implementing DMARC you need to consider the following factors:

1) Make sure you have a valid and published SPF record on your DNS

For your inactive or parked domains, you only need a record that specifies that the particular domain is currently inactive and any email originating from it should be rejected. An empty SPF record with the following syntax does exactly that:

yourparkeddomain.com TXT v=spf1 -all

2) Be certain that you have a functional DKIM record published on your DNS

The best way to nullify DKIM selectors that were active in the past is to publish a DKIM record with (*) as your selector and an empty “p” mechanism. This specifies to MTAs that any selector for that parked domain is not valid anymore:

*._domainkey.yourparkeddomain.com TXT v=DKIM1; p=

3) Publish a DMARC record for your Parked Domains

In addition to publishing SPF, you should publish a DMARC record for your parked domains. A DMARC policy of “reject” for your inactive domains helps secure them. With DMARC you can also view and monitor fraudulent activities on these domains with reports you can view on our DMARC report analyzer dashboard.

You can configure the following DMARC record for your parked domains:

_dmarc.yourparkeddomain.com TXT “v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]

 

Note: replace the sample RUA and RUF email addresses with valid email addresses (that don’t point to your parked domains) wherein you want to receive your DMARC reports. Alternatively, you can add your custom PowerDMARC RUA and RUF addresses to send your reports directly to your PowerDMARC account and view them on your DMARC report analyzer dashboard.

In case you have a large number of previously registered parked domains, you can configure the following CNAME record that points to a single domain, for all your parked domains:

_dmarc.yourparkeddomain.com  CNAME   _dmarc.parked.example.net

Once done, you can then publish a DMARC TXT record that points to the email addresses on which you want to receive your RUA and RUF reports, for that same domain on which you have configured DMARC for your parked domains:

_dmarc.parked.example.net TXT v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]

To avoid implementing DMARC for your active and parked domains manually, help us help you automate the process and make it seamless for your organization with our proactive support team and an effective DMARC software solution. Sign up for your DMARC analyzer today!

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Lower Your Email Bounce Rates with DMARC

Domain-based Message Authentication, Reporting & Conformance (DMARC) is a specification that allows you to prevent email spoofing and phishing attempts. In a nutshell, DMARC allows you to implement a policy that helps verify that your email messages can be trusted by your recipients’ mail servers. DMARC can lower your email bounce rates by improving your domain reputation and email deliverability. It also boosts your email marketing campaigns, improves the sender reputation of your domain, and makes receiving emails more secure.

A high email bounce rate can seriously hurt the success rate of your email marketing campaigns in the future. Surveys suggest that 50% of all emails sent out by the marketing professionals at your organization, never even reach the inboxes of your prospective clients. From there, many face a further challenge in actually getting read, with many more emails ending up in your trash or spam folder than any other location. Luckily for us, DMARC is an email authentication standard that’s very close to a reality where it will fix these issues. Let’s find out how!

Why Do Email Bounces Occur?

Sometimes your outbound email gets rejected by the recipients’ mail server. When an email bounces, it is because the email server thinks that there’s a problem or error with how you sent the message. Email bounces can occur due to a wide variety of reasons, here are a few:

  • Server downtime
  • Your receiver’s inbox is full
  • Poor sender reputation as a result of spam complaints

While the first two scenarios are quite easy to handle, the third scenario is where matters get a little tricky and complicated. More often than not your domain can be spoofed by attackers, meaning that your very domain name can be used to send fake emails to phish your recipients. Repeated spoofing attempts on your domain and emails containing fraudulent attachments sent to your receivers can drastically damage your sender’s reputation. This increases the chances of your emails being marked as spam and aggravates the risk of email bounces.

A DMARC analyzer helps you stop email spoofing and protects your receivers from accepting fake emails sent from your domain. This, in turn, upholds your reputation and credibility and lowers your email bounce rate over time.

DMARC and Deliverability

If you run an online business, you already know how important email deliverability is. To maximize profit on your email marketing campaigns, you need to ensure that legitimate emails always get delivered and reduce the chances of your emails being marked as spam in your recipients’ inboxes.

The most effective way to secure user trust is by not allowing phishing and spam emails. But to do this you will need the credibility of appearing legitimate – in other words, your users need to recognize your emails as being real emails and not spam. DMARC is designed to reduce the number of spam emails delivered to your recipients’ inboxes while ensuring legitimate emails from your domain are always successfully delivered. DMARC provides a method for sending organizations to ensure that emails are delivered reliably and offers domain protection using SPF/DKIM records. DMARC is based on the concept of alignment between authentication protocols (the aforementioned SPF and DKIM) and reports describing sender usages such as message repudiation or policy violations.

Monitor Your Email Channels with DMARC Reports

While implementing DMARC, experts recommend that you start off with a none policy and enable DMARC reporting for all your domains. Although a none policy for DMARC doesn’t protect your domain against spoofing and phishing attacks, it is ideal when you want to simply monitor all your email channels and view how your emails are performing. A DMARC report analyzer is the perfect platform to do exactly that, and much more! It helps you view all your email sending sources across a single pane of glass, and fix issues in email delivery.

Slowly, but surely, you can confidently shift to a more enforced policy so as to stop attackers from misusing your domain name. To further increase the chances of your legitimate emails reaching your clients, you can implement BIMI at your organization. Brand Indicators for Message Identification (BIMI), as the name suggests, helps your clients visually identify your brand in their inboxes by affixing your unique logo to each of your outbound emails. This makes your email marketing campaigns more of a success and reduces the chances of email bounces even further!

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Why is Domain Name Security So Important for Today’s Businesses?

Domains have grown at an explosive rate over the last decade. With a decades-long history and the power to build trust, domains have long been the premier asset for businesses, online. Domain name security is a top concern for domain holders, and today’s online threats make managing domains more complex than ever. In the 1980s, the first top-level domains were established on the internet. Since then, there have been notable developments in domain name architecture, resulting in more security challenges and costs for businesses and consumers alike. Since their inception, domains have become a channel for cyberattacks and threats to online data and security. DMARC is a widely acclaimed protocol that protects your domain name and online assets from abuse and impersonation.

But before we get to that, here are three reasons why protecting your domain name should be your topmost priority starting today:

Your Domain is the Face of Your Company

Your domain is a reflection of your brand and is one of the most important online assets of your organization. The domain name is the digital address of your business and is an important part of your IP portfolio. It’s the first thing that potential customers and investors will see. Research shows that domains are now one of the most valuable elements of a company’s business, alongside intellectual property rights, easily identifiable assets, and shares. Domains are a vital part of any business’s IP portfolio, providing a long-term and authoritative presence on the Internet. It is essential to protect and renew them. Acquisition or abuse of domain names by cybercriminals can cause clients, customers, and partners to become inconsolable.

Domain Management is Not an Easy Task

Organizations now realize that their domain represents their business goals and creates that unified public face of the company that customers recognize when searching for products and services. As organizations become increasingly reliant on IP assets, domain management is likely to become more of a liability. The domains that are now the cornerstone of an organization’s security must be effectively managed, not just handled by internal IT teams. However, domain management poses its own set of security challenges. With the increasing number of domains each company owns, impersonating your organization for malicious ends becomes quite easy.

Did you know, 33% of organizations experienced cyberattacks specifically targeting their domain names in 2020?

Lack of Domain Name Security Increases the Risk of Domain Spoofing

Domain spoofing is a social engineering tactic, popular among cybercriminals of the digital age. A spoofed email domain accurately impersonates a valid domain and can be used to trick employees, customers, and partners who rely on your services. Spoofed domains are used to send fake emails to customers to perpetrate phishing attacks aimed at stealing sensitive data and bank details to launder money, or inject ransomware into their system. Suffice to say, it is extremely damaging to any business, both financially, as well as reputationally.

How to Secure Your Domain Name?

DMARC (Domain-based Message Authentication, Reporting & Conformance) is a mechanism letting organizations protect their domain name from impersonation, domain abuse, and spoofing. It helps stop phishing (which is the leading cause of identity theft) by creating a 100% reliable mechanism for authenticating emails that are sent from your domain. It prevents unauthorized parties from setting up email accounts using a legitimate organization’s domain name. Configuring a DMARC analyzer at your organization can provide all-around protection to your domain name, helping you make sure that your reputation remains intact and your domain can never be used for malicious purposes.

Manage Your Domains Effectively with PowerDMARC DMARC Report Analyzer

With our DMARC report analyzer, you can manage your domains across a single pane of glass, read your DMARC reports, view authentication results, and pick up on malicious activities faster. It also allows you to adjust settings on the fly for immediate changes. Whether you are a small business or enterprise, a DMARC report analyzer gives you deeper control over how you manage email authentication.

Most importantly, it gives you a single place to manage the domains that you own from multiple registrars. Our intuitive interface provides a descriptive breakdown of each failure, helping you take action against them faster than ever before.

  • It provides a single, integrated solution for reading your DMARC reports
  • It provides the ability to quickly identify anomalies in your reports.
  • With report filtering options, this powerful module will allow you to better manage your domain’s health across multiple domains across various mail servers
  • Provides a clear view of the overall picture of how your emails are protected, bounce back messages, and what malicious activities are being attempted on your domain
  • Helps you save time by knowing the full picture with a reliable and clear dashboard that gives you a simple overview of your data
  • Highlights any errors in your SPF, DKIM, BIMI, MTA-STS record and TLS-RPT.

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How to Leverage Email Authentication Solutions (SPF, DKIM, and DMARC) to Stop Email Spoofing?

Email authentication standards: SPF, DKIM, and DMARC are showing promise in cutting down on email spoofing attempts and improving email deliverability. While differentiating spoofed (fake) emails from legitimate ones, email authentication standards go further in distinguishing if an email is legitimate by verifying the identity of the sender.

As more organizations adopt these standards, the overall message of trust and authority in email communication will begin to reassert itself. Every business that depends on email marketing, project requests, financial transactions, and the general exchange of information within or across companies needs to understand the basics of what these solutions are designed to accomplish and what benefits they can get out of them.

What is Email Spoofing?

Email spoofing is a common cybersecurity issue encountered by businesses today. In this article, we will understand how spoofing works and the various methods to fight it. We will learn about the three authentication standards used by email providers − SPF, DKIM, and DMARC to stop it from happening.

Email spoofing can be classified as an advanced social engineering attack that uses a combination of sophisticated techniques to manipulate the messaging environment and exploit legitimate features of email. These emails will often appear entirely legitimate, but they are designed with the intention of gaining access to your information and/or resources. Email spoofing is used for a variety of purposes ranging from attempts to commit fraud, to breach security, and even to try to gain access to confidential business information. As a very popular form of email forgery, spoofing attacks aim to deceive recipients into believing that an email was sent from a business they use and can trust, instead of the actual sender. As emails are increasingly being sent and received in bulk, this malicious form of email scam has increased dramatically in recent years.

How can Email Authentication Prevent Spoofing?

Email authentication helps you verify email sending sources with protocols like SPF, DKIM, and DMARC to prevent attackers from forging domain names and launch spoofing attacks to trick unsuspecting users. It provides verifiable information on email senders that can be used to prove their legitimacy and specify to receiving MTAs what to do with emails that fail authentication.

Hence, to enlist the various benefits of email authentication, we can confirm that SPF, DKIM, and DMARC aid in:

  • Protecting your domain from phishing attacks, domain spoofing, and BEC
  • Providing granular information and insights on email sending sources
  • Improving domain reputation and email deliverability rates
  • Preventing your legitimate emails from being marked as spam

How Do SPF, DKIM, and DMARC Work Together to Stop Spoofing?

Sender Policy Framework

SPF is an email authentication technique used to prevent spammers from sending messages on behalf of your domain. With it, you can publish authorized mail servers, giving you the ability to specify which email servers are permitted to send emails on behalf of your domain. An SPF record is stored in the DNS, listing all the IP addresses that are authorized to send mail for your organization.

If you want to leverage SPF in a way that would ensure its proper functioning, you need to ensure that SPF doesn’t break for your emails. This could happen in case you exceed the 10 DNS lookup limit, causing SPF permerror. SPF flattening can help you stay under the limit and authenticate your emails seamlessly.

DomainKeys Identified Mail

Impersonating a trusted sender can be used to trick your recipient into letting their guard down. DKIM is an email security solution that adds a digital signature to every message that comes from your customer’s inbox, allowing the receiver to verify that it was indeed authorized by your domain and enter your site’s trusted list of senders.

DKIM affixes a unique hash value, linked to a domain name, to each outgoing email message, allowing the receiver to check that an email claiming to have come from a specific domain was indeed authorized by the owner of that domain or not. This ultimately helps to pick up on spoofing attempts.

Domain-based Message Authentication, Reporting and Conformance

Simply implementing SPF and DKIM can help verify sending sources but isn’t effective enough to stop spoofing on their own. In order to stop cybercriminals from delivering fake emails to your recipients, you need to implement DMARC today. DMARC helps you align email headers to verify email From addresses, exposing spoofing attempts and fraudulent use of domain names. Moreover, it gives domain owners the power to specify to email receiving servers how to respond to emails failing SPF and DKIM authentication. Domain owners can choose to deliver, quarantine, and reject fake emails based on the degree of DMARC enforcement they need.

Note: Only a DMARC policy of reject allows you to stop spoofing.

Additionally, DMARC also offers a reporting mechanism to provide domain owners with visibility on their email channels and authentication results. By configuring your DMARC report analyzer, you can monitor your email domains on a regular basis with detailed information on email sending sources, email authentication results, geolocations of fraudulent IP addresses, and the overall performance of your emails. It helps you parse your DMARC data into an organized and readable format, and take action against attackers faster.

Ultimately, SPF, DKIM, and DMARC can work together to help you catapult your organization’s email security to new heights, and stop attackers from spoofing your domain name to safeguard your organization’s reputation and credibility.

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