Cybersecurity Solutions
Email Security & Anti-Spoofing (SPF, DKIM & DMARC)
Stop attackers from impersonating your business domain
Business email is one of the most common attack targets for SMEs. Attackers don’t need to hack your mailbox to cause damage — they can simply send an email that looks like it came from finance@yourcompany.com or director@yourcompany.com, and count on the recipient trusting the domain.
Topone’s Email Security & Anti-Spoofing service configures and manages SPF, DKIM and DMARC — the three DNS-based authentication standards that let receiving mail systems verify whether a message claiming to be from your domain is genuine. Suitable for businesses on Microsoft 365, Google Workspace, or any other business email platform.
Key Features
SPF (Sender Policy Framework)
We review every service that sends email on your domain’s behalf — your mail platform, CRM, accounting system, marketing tools, website contact forms — and configure a single, correct SPF record. Done wrong, SPF can block your own legitimate email; done right, it tells receiving servers exactly which senders are authorized.
DKIM (DomainKeys Identified Mail)
We enable DKIM signing on your mail platform and any third-party services that need it, so outgoing messages carry a verifiable digital signature proving they came from an authorized system and weren’t altered in transit.
DMARC (Domain-based Message Authentication, Reporting & Conformance)
DMARC ties SPF and DKIM together and tells receiving mail servers what to do with messages that fail authentication. We roll this out in stages so legitimate email is never put at risk:
- Monitor — collect DMARC reports with no enforcement, to see what’s actually sending mail as your domain.
- Review — identify every legitimate sending source (including ones you may have forgotten about).
- Enforce — once everything legitimate is accounted for, tighten the policy to actively block spoofed mail.
What This Protects Against
- Business Email Compromise (BEC) and CEO/management impersonation
- Fake invoice and payment-redirect fraud
- Supplier and customer impersonation
- Phishing campaigns sent “from” your own domain
- Reputational damage from spoofed mail reaching your customers
Important: Email authentication protects your domain’s identity — it doesn’t replace anti-spam filtering, endpoint protection, or user security awareness training. It’s one layer of a broader email security setup, and we’re happy to discuss the others as part of a full review.
Why SME Businesses Choose Topone for This
Getting SPF/DKIM/DMARC wrong is easy — a misconfigured SPF record can silently break legitimate email, and jumping straight to DMARC enforcement without reviewing your senders first can block real customer or invoice emails. Topone’s staged approach and ongoing monitoring means you get stronger protection without the risk of breaking mail that matters.
Talk to Topone about securing your business email domain.