Email Security for Your Business
Protect your domain from impersonation, phishing, and business email compromise.
Email is still the number one entry point for cyber attacks. Without proper protections in place, attackers can impersonate your domain and send fraudulent messages to your customers, vendors, or employees.
Realm Defense helps businesses secure their email systems so every message sent from your domain can be trusted and verified.
Why Email Security Matters
Without proper protections, attackers can:
- Impersonate your domain
- Send fraudulent payment requests
- Steal login credentials
- Launch ransomware attacks
Even worse, your reputation is on the line when attackers send emails pretending to be your organization.
The Three Foundations of Email Security
These three protocols work together to protect your domain from email spoofing and impersonation.
SPF — Sender Policy Framework
SPF identifies which mail servers are authorized to send email from your domain. Receiving servers check this record to confirm that messages claiming to be from your organization are actually sent from approved systems.
DKIM — DomainKeys Identified Mail
DKIM adds a cryptographic signature to your email messages. This allows receiving servers to verify that the email was authorized by your domain and that the message was not altered in transit.
DMARC — Domain-based Message Authentication, Reporting & Conformance
DMARC ties SPF and DKIM together and instructs receiving mail systems what to do when authentication fails. This allows your domain to block spoofed emails and receive reports showing who is sending mail on your behalf.
MTA-STS and TLS-RPT
SPF, DKIM, and DMARC stop spoofing of your domain. MTA-STS goes a step further by requiring that mail sent to your domain is encrypted in transit and delivered to a server with a matching certificate. TLS-RPT gives you visibility into when those checks fail.
It is increasingly expected by enterprise vendor questionnaires and cyber insurance reviews, and the rollout is straightforward for Microsoft 365 and Google Workspace tenants.
Read the MTA-STS GuideThe Reality for Many Businesses
Realm Defense audits and configures these protections so your customers and partners can trust the authenticity of emails sent from your organization.
Email Security Assessment
Realm Defense can review your organization's email configuration and identify gaps in your defenses.