Email Security Monitoring and DMARC Management for Small and Medium-Sized Businesses
Email remains the primary vector for cyberattacks targeting businesses of all sizes. Without properly configured email authentication records, any attacker can send emails that appear to come from your company's domain — whether to your own employees as internal phishing, to your customers impersonating your brand, or to financial institutions in business email compromise (BEC) fraud. ExposureIndex continuously monitors your email security posture, validating your SPF, DKIM, DMARC, and DNSSEC configuration and alerting you to any gaps that leave your domain open to spoofing, fraud, and deliverability problems.
Understanding Email Security Records: SPF, DKIM, DMARC, and DNSSEC
SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of your domain. Without a valid SPF record, any server can claim to send mail from your address. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails that receiving servers can verify, proving the message was not altered in transit. DMARC (Domain-based Message Authentication, Reporting, and Conformance) builds on SPF and DKIM to tell receiving mail servers what to do when a message fails authentication — quarantine it, reject it, or do nothing. A strong DMARC policy with a reject or quarantine action is the most effective protection against your domain being used in phishing attacks. DNSSEC protects your domain name resolution from tampering. ExposureIndex checks all four protocols on every scan.
The Business Risk of Email Spoofing for SMEs
Business email compromise is one of the most financially damaging cyberattacks targeting small and medium-sized businesses. In a BEC attack, a criminal sends an email that appears to come from your CEO or finance director, requesting an urgent wire transfer or asking a supplier to update their bank account details. Without DMARC protection, your domain can be spoofed with no technical sophistication. Customers who receive fake invoices from your apparent domain, employees who receive fraudulent requests from their apparent manager, and suppliers who receive manipulated payment details — all are enabled by missing or misconfigured DMARC records. ExposureIndex detects these gaps before attackers exploit them.
How ExposureIndex Monitors Your Email Security
On every scan cycle, ExposureIndex queries the DNS records for your domain and all discovered subdomains. We check for the presence and syntactic validity of SPF, DKIM, DMARC, and DNSSEC records. For DMARC specifically, we analyze the policy strength — a p=none policy provides visibility but no protection, while p=quarantine or p=reject actively prevents spoofed emails from reaching recipients. We also check for common DMARC misconfigurations such as overly broad SPF includes that can be exploited by third-party services. Your email security report section clearly explains each finding and provides the exact DNS record changes needed to remediate any gaps.
Email Security and Regulatory Compliance
NIS2, the EU's updated Network and Information Security directive, requires SMEs in scope to demonstrate technical controls against phishing and social engineering attacks. DMARC is explicitly referenced by security frameworks including NCSC's Mail Check service and CIS Controls as a fundamental email security control. ISO 27001 Annex A includes controls covering email security and protection against malware delivered via email. Our email security reports provide the documented evidence that your domain is actively protected, supporting your NIS2 risk management obligation and any supplier security questionnaire that asks about email authentication protocols.
Core Features of ExposureIndex Email Security Monitoring
SPF Record Validation
We check that your SPF record exists, is syntactically valid, does not exceed the DNS lookup limit of 10, and does not include overly permissive mechanisms that unauthorized senders could exploit.
DKIM and DMARC Policy Analysis
We assess your DKIM selector configuration and your DMARC policy strength. A p=none policy generates a finding with a recommendation to upgrade to p=quarantine or p=reject for active protection.
DNSSEC Validation
DNSSEC prevents attackers from redirecting your domain's DNS records to malicious infrastructure. We check whether DNSSEC is enabled and correctly signed for your domain.
Remediation-Ready Reports
Every email security finding includes the exact DNS record or configuration change needed to resolve it, in the format your DNS provider or IT support can implement directly.
Protect Your Domain From Email Spoofing
Check whether your domain can be spoofed in under 24 hours. ExposureIndex scans your email security records and delivers a clear report with remediation steps.
Start Email Security Assessment