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What is DKIM?

by SW Team

DKIM (DomainKeys Identified Mail) is a primary security measure against email spoofing, in this blog we will explain what it is and why it is important.


What is DKIM? DKIM, or DomainKeys Identified Mail, is an email authentication standard that helps verify the authenticity of the sender and the integrity of the message. In essence, DKIM provides a way to digitally sign emails, allowing recipients to confirm that an email actually comes from the entity it claims to be from and that its contents have not been altered in transit.

How does DKIM work? The DKIM process begins when an email leaves for its destination. The sender digitally signs the message using a private key associated with its domain. This signature includes a series of cryptographic data based on the content of the message. When the mail arrives at the destination server, it looks up the DKIM public key in the DNS records of the sender's domain. Using this public key, the destination server verifies the DKIM signature of the message. If the signature is valid and matches the content of the message, it is considered authentic and has not been modified in transit.


Why is DKIM important?

  1. Phishing and spoofing prevention: DKIM helps mitigate the risk of emails being spoofed by attackers. By verifying the authenticity of the sender, recipients can identify and filter fraudulent emails, such as those used in phishing attacks.

  2. Content integrity: DKIM ensures that the content of the message has not been tampered with or altered during delivery. This is essential to maintain confidence in the integrity of the information transmitted via email.

  3. Sender reputation: Implementing DKIM can improve the reputation of the sender's domain. Receiving e-mail servers consider DKIM-signed messages as more trustworthy and legitimate, which can help prevent legitimate e-mails from being flagged as spam.

  4. Compliance with security standards: DKIM is an internationally recognised standard, which means that its implementation helps to comply with email security best practices and data privacy regulations.

In a world where cyber security is a constant concern, DKIM stands as an essential tool for securing and authenticating email. By verifying the authenticity of the sender and ensuring the integrity of the message content, DKIM plays a critical role in building trust in digital communication. Understanding and adopting DKIM is therefore crucial to maintaining the security and integrity of email in an increasingly digitally connected world.