Your Domain Is the One Everyone Spoofs

Without correct email authentication, attackers send messages that claim to come from your domain. Receiving mail systems cannot verify your legitimate messages. You have no reporting and no enforcement. The result: your customers get fake invoices from “your” CFO, and your legitimate emails land in Gmail's spam folder because the authentication check fails.

This is not a failure of your IT team. Email authentication works only when SPF, DKIM, and DMARC are deployed together, tuned to your real sending landscape, and rolled out in stages. Microsoft filters spoofed mail out of the box, but it cannot speak for your domains: no Microsoft 365 domain gets a DMARC record automatically, and your custom domains stay unsigned until someone publishes the DKIM keys. That is the gap attackers use — and every marketing tool, CRM, or ERP that sends email on your behalf widens it.

Traditional consulting for email authentication? Five figures. The consultant updates DNS, writes a doc, leaves. Three months later, a new subsidiary sends from a different provider and the setup breaks. Nobody notices until Gmail starts quarantining.