When you send an invoice to a client, that email carries authentication records published in your domain's public DNS configuration. These records (SPF and DMARC) are how receiving mail servers verify that the message actually came from you. If those records are missing, incomplete, or configured too permissively, anyone on the internet can send an email that appears to come from your exact corporate email domain. Missing or broken authentication records allow external attackers to impersonate your identity, intercept outbound invoices, and trick your clients into routing payments directly to fraudulent accounts.
The client's email software has no technical mechanism to flag it as fake. It arrives in their inbox with your name and your email address in the sender field, indistinguishable from a legitimate message.
Concrete example
Your business sends a $12,000 invoice to a client. A criminal who has been watching your domain sends a "follow-up" from your exact address two days later, explaining that your banking information recently changed and providing a new account number. The client pays. The funds transfer to the criminal. You pursue collection on the original invoice. The client insists they already paid.
This attack is called Business Email Compromise. It is the most financially damaging cybercrime category in the United States measured by total dollar loss, according to FBI reporting. Fixing the underlying DNS records costs nothing except a few minutes of your IT team's time. Being unaware of the gap costs everything.
When we review your domain, we pull your full DNS mail configuration and check three things: whether your SPF record exists and is scoped correctly to prevent third-party sending, whether your DKIM public key is published and valid, and whether your DMARC policy is published and set to actually enforce rather than just monitor. You receive the exact DNS text records your IT team needs to publish to close each gap.