Securing Your Emails: Understanding the Role of Email Security Protocols in Deliverability

September 23, 2023
Securing Your Emails: Understanding the Role of Email Security Protocols in Deliverability

In today's digital age, how we communicate has dramatically shifted. One of the ways we continue to use is email. However, with this convenience comes significant responsibility: ensuring email security and deliverability. Email security is not just a matter of protecting your information from unauthorized access - it plays a crucial role in whether your message will reach its destination. 

Think of email security protocols as digital bodyguards for your emails. These guards ensure the safety and integrity of your messages through the web. They are a barrier between your message and potential threats - such as scams, identity theft, impersonation... 

We will discuss the importance of email security protocols and their role in email deliverability. It is not only important for businesses but for individuals as well to have this bodyguard to keep their personal or business data secure and to ensure the deliverability of emails. 

Understanding Email Security Protocols 

Email security protocols are essentially a set of rules that enable the secure transit of messages over the internet. These protocols function much like digital stamps of approval, assuring that a message is genuine and hasn't been meddled with while on its journey through the internet. Their main job is to shield your data from prying eyes and guarantee that your email successfully lands in the intended inbox. 

Many protocols are working to secure email, each playing a unique part in this process. Here's an overview of the most common ones: 

SPF (Sender Policy Framework): This protocol helps prevent spammers' unauthorized use of your domain. SPF checks if the sender's IP address is on your domain list of permitted sources. 

DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your email that verifies that the message was sent from your domain and has not been changed during transport. 

DMARC (Domain-based Message Authentication, Reporting & Conformance): DMARC uses SPF and DKIM to verify messages' authenticity and provides feedback on how recipients treat emails that fail these checks. 

BIMI (Brand Indicators for Message Identification): BIMI allows brands to display their logo alongside their emails, enhancing recognition and trust among recipients. 

SSL/TLS (Secure Sockets Layer/Transport Layer Security): These protocols encrypt data during transit, preventing unauthorized access. 

SMTPS (Secure SMTP): This version of the SMTP protocol uses encryption for secure email transmission.

STARTTLS: This protocol enables an upgrade from a plain, unencrypted connection to a secure one. 

MTA-STS (Mail Transfer Agent Strict Transport Security): MTA-STS helps protect against "man-in-the-middle" attacks by enforcing an encrypted connection between mail servers. 

These protocols are key tools for maintaining the integrity and security of your email. Using them ensures your email reaches its destination and your data and reputation stay protected.

The Importance of Email Security for Deliverability

Email security protocols play a crucial role in determining whether your email will successfully reach its destination, that is, the recipient's mailbox - or it will end up in spam or even be completely blocked. 

When you send an email, the servers receiving it perform a series of checks to verify its legitimacy. Is it sent from an authorized domain? Has it been altered during transport? Does the domain from which it was sent have a good reputation? Servers look for answers to these questions and email security protocols are the tools that enable getting those answers. 

Attacks like Man-in-the-Middle and eavesdropping pose a serious threat to email security. In Man-in-the-Middle attacks, a hacker inserts themselves into communication between two parties and can intercept, modify, or steal information. Eavesdropping is similar but more focused on passive spying on communication. 

That is why we need email security protocols - they provide protection against such attacks in several ways. For example, protocols like SSL/TLS, SMTPS, and MTA-STS encrypt data during transport, preventing unauthorized access. DKIM adds a digital signature to your email, allowing recipients to check whether the message has been altered during transport. SPF checks if the sender's IP address is on the list of allowed sources for your domain, which helps prevent spammers' unauthorized use of your domain. 

Email security protocols safeguard your data and increase your email deliverability.

How to Improve Email Delivery Through Authentication 

Email authentication is a key component in ensuring your email's successful delivery. You can implement some of the authentication protocols, including SPF, DKIM, DMARC, and BIMI.  Have you ever wondered how each of these protocols works and how you can use them to improve your email delivery? 

SPF (Sender Policy Framework): The SPF protocol helps prevent sender impersonation by checking whether the incoming email comes from a server listed in the domain's SPF records. To implement SPF, you must add an SPF record to your domain's DNS listing all the IP addresses authorized to send email from your domain. 

DKIM (DomainKeys Identified Mail): The DKIM protocol adds a digital signature to your email, which recipients can use to verify whether the message has been altered during transport. To implement DKIM, you must generate a pair of keys (one private for signing emails, one public for signature verification) and add a DKIM record to your domain's DNS. 

DMARC (Domain-based Message Authentication, Reporting & Conformance): The DMARC protocol uses information from SPF and DKIM to decide what to do with messages that don't pass these checks. It also provides reports on who is trying to abuse your domain. To implement DMARC, you should add a DMARC record to your domain's DNS listing your policy for handling messages that don't pass SPF or DKIM checks. 

BIMI (Brand Indicators for Message Identification): The BIMI protocol allows you to display your branded logo in your emails, enhancing brand recognition and user trust. To implement BIMI, you need to add a BIMI record to your domain's DNS containing the URL to your logo.

You must implement these protocols to enhance email security and boost your email delivery. When your email successfully goes through these authentication verifications, the odds of it landing directly in the recipient's inbox instead of being relegated to the spam folder increase substantially. These protocols also shield your domain against any abuse, which can harm your reputation and impact email delivery.

Best Practices and Protocols for Email Security

Email security may seem technical, but it is key to protecting your business. It is important to stay updated and implement the latest measures and best practices to mitigate risks. 

Introducing the best practices for email security is not just a recommendation - it's a necessity.

These practices range from simple steps like regularly changing passwords and using two-factor authentication to more complex measures like public key cryptography for encrypting messages. 

The methodology of email encryption heavily relies on public key cryptography, where users exchange keys to decode the message. This is one of the best practices for cloud encryption.

Best practices for login security are designed to protect individuals and organizations. Identity theft scams, for example, use deceptive emails.

How to Use Automated Protocols for Data Protection in Email

Antivirus, anti-malware, and internet security are terms often used interchangeably but have different functions. The best practice is to develop and implement these measures to secure our digital assets.  Every EU member state must adopt a national network and information security strategy, adhering to the best practices guide provided by ENISA.


Email security is no longer just a technical issue - it's a key component in protecting the integrity and safety of your business and personal data. To enhance the security of your email, you need to implement some or all of these protocols. That it's the only way to strengthen the defense from digital threats. 

Email security is one of the most important things to consider when it comes to maintaining the integrity of your business. Therefore, invest time and resources to ensure your data protection methods are up to par.

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