Why E-mail Protocols Are Inadequate for Security
Email is still one of the most critical communication channels for organizations today. However, authentication protocols such as SPF, DKIM and DMARC alone are not always enough to stop fake emails.
Weaknesses of SPF, DKIM and DMARC
SPF (Sender Policy Framework):
It checks whether the servers used to send e-mail are authorized. However, this check may be invalid when forwarding mail. An attacker can also bypass SPF by using their own domain name.
DKIM (DomainKeys Identified Mail):
It signs the content of the sent email, thus guaranteeing that it has not been modified before it reaches the recipient. However, an attacker can open a fake domain and insert their own DKIM key.
DMARC (Domain-based Message Authentication, Reporting & Conformance):
SPF and DKIM evaluate their results, but if the domain owner does not write the correct policy (e.g. leaves "none"), the attacker can continue to send fake emails.
As a result, these three protocols greatly reduce fake emails, but advanced phishing or brand impersonation cannot stop their attacks completely.
Additional Layers to Strengthen Email Security
BIMI (Brand Indicators for Message Identification)
Increases user trust by displaying the organization logo next to verified emails.
->More about BIMI
MTA-STS & TLS-RPT
Require emails to be transmitted only over encrypted (TLS) channels. Reduces the risk of eavesdropping on the road.
-> Click for detailed information
ARC (Authenticated Received Chain)
Protects trust by verifying the chain when SPF/DKIM is broken in forwarded mails.
-> More about ARC
Secure Email Gateways (SEG)
In addition to SPF/DKIM/DMARC checks, it performs content filtering, sandboxing, URL protection and malicious attachment file analysis.
-> Learn about the SEG difference
EDR / XDR Integration
It analyzes incoming mails based on their content and behavior, not just their signatures.
-> Discover the Cynet Email Protection solution
User Awareness & Phishing Simulations
The strongest layer of security is still human awareness. Because fake emails can sometimes pass all technical tests.
-> Click for effective mindfulness programs
Conclusion Multi-layered Security Essential
SPF, DKIM and DMARC alone are not enough.
Organizations should prevent invisible risks against email threats by expanding their security layers.
As Detech, we offer multi-layered e-mail security solutions to organizations with our Fortra and Cynet partnerships.
info@detech.com.tr
