Email Security & Domain Infrastructure
DMARC Implementation and Enforcement
Publishing a DMARC record is only the beginning. Effective protection requires understanding every legitimate sender, establishing aligned authentication, and tightening policy deliberately.
Discuss a DMARC implementation →Discover and classify senders
Inventory domains, subdomains, vendors, platforms, and message types. Use DNS, headers, and aggregate reports to distinguish legitimate infrastructure from unknown or obsolete paths.
Correct authentication and alignment
Repair SPF and DKIM configuration, address lookup-limit risks, configure custom-domain signing where supported, and confirm that at least one authenticated identity aligns with the visible From domain.
Enforce in stages
Move from p=none toward quarantine or reject using reporting data, representative tests, defined rollback points, and explicit ownership. Tightening policy before the sender inventory is understood can interrupt legitimate mail.
Document the operating model
Leave behind the records, approved sending paths, responsible owners, and change controls needed to keep a later vendor addition from weakening the domain's protection.
How the engagement works
Start with the current policy and sending environment. Establish the sender inventory, correct the agreed records and platform settings, then use reporting and testing to guide staged enforcement.
Typical inputs
Domain(s), current DMARC policy if known, legitimate senders, existing reporting, DNS records, SPF and DKIM configuration, and the Microsoft 365, Google Workspace or other platforms involved.
What you receive
Corrected authentication configuration, an approved-sender inventory, an enforcement plan with rollback points, implementation records, and post-change verification.
Scope boundary
This is defined email-security and domain-infrastructure work—not a substitute for general managed IT, mailbox administration, endpoint management, or an always-on security operations service.
Common situations
A domain is ready to move beyond p=none, SPF has become fragile, DKIM passes without alignment, a new sender must be authorized, or the organization needs a controlled path toward quarantine or reject.
Start with the current policy and sending environment.
Domain(s), current DMARC policy if known, legitimate senders, existing reporting, DNS records, SPF and DKIM configuration, and the Microsoft 365, Google Workspace or other platforms involved.
Discuss a DMARC implementation