When it comes to domains and email, you inevitably end up in the realm of DNS, the system that translates intuitive names like artera.net into IP addresses that machines can understand.
What is often overlooked is that DNS is not only used for web browsing: it also plays a decisive role in email delivery.
Every message sent goes through a series of checks based precisely on DNS, used to determine whether the sender is legitimate, whether they are authorized to send on behalf of that domain, and whether the email content has remained intact during transmission.
To do this, the mail server queries specific DNS records that:
- Indicate which servers are authorized to send email on behalf of your domain;
- Verify that the message has not been altered;
- Define how to handle any anomalies or suspicious activity.
When these records are not configured correctly, the outcome is predictable: emails are likely to end up in spam, or worse, not be delivered at all leading to loss of domain reputation and increased vulnerability to spoofing and phishing attacks.
The three pillars of email authentication: SPF, DKIM, and DMARC
The first is SPF, a record that defines which servers are allowed to send email on your behalf. In practice, it creates a list of “authorized” IP addresses and prevents third parties from impersonating your domain for spam or phishing activities. If an email comes from a server that is not listed in the SPF record, the recipient can reject it or mark it as suspicious.
The second is DKIM, which adds a digital signature to emails based on a public and private key system. This signature proves not only that the message truly originates from the stated domain, but also that its content has not been altered during transit. It is the modern equivalent of a wax seal: if the signature does not match, something is wrong.
Finally, there is DMARC, the protocol that brings order and coordination to SPF and DKIM by telling the receiving server how to behave when a check fails. It can simply monitor the situation, move the message to spam, or block it entirely. In addition, it sends valuable reports that help identify attempts to abuse the domain. Without DMARC, even with SPF and DKIM enabled, email providers would still struggle to handle suspicious messages correctly.
Why correctly configuring SPF, DKIM, and DMARC is essential
DNS records are not just technical settings: they are the core of email authentication, the mechanism that makes the difference between a message being successfully delivered and one being blocked. Accurately configuring SPF, DKIM, and DMARC means protecting your digital identity, improving the effectiveness of your communications, preserving your domain’s reputation, and preventing fraud attempts. When set up correctly, these tools dramatically improve deliverability and safeguard domain reputation.
DNS records are not mere technical entries: they are the heart of the authentication system that determines whether your emails will be considered trustworthy or not.
Correctly configuring SPF, DKIM, and DMARC means protecting your digital identity, improving the effectiveness of your communications, safeguarding your domain’s reputation, and preventing attacks and misuse.
In the world of email, security and deliverability are never a matter of chance: they are the result of a well executed DNS configuration.
If you want to optimize your domain setup or verify that your DNS records are correctly configured, the Artera team can support you step by step.
