Email Security & Domain Infrastructure
Email Deliverability and Authentication Troubleshooting
A focused diagnostic engagement for legitimate email that is rejected, deferred, routed incorrectly, or classified as spam.
Describe the delivery problem →Start with the message path
Review complete headers, authentication results, Return-Path and DKIM identities, sending IPs, relay and connector behavior, and the response from external receiving systems.
Investigate the likely cause
The cause may be SPF, DKIM, DMARC alignment, DNS, routing, reputation, recipient policy, or a third-party platform configuration. A single DNS change is rarely enough without understanding the path.
Work across the platforms involved
Troubleshooting may involve Microsoft 365, Google Workspace, Salesforce, marketing and helpdesk platforms, transactional senders, relays, registrars, and DNS providers.
Define the next step
The result is a written diagnosis and a recommended correction path. A focused investigation can remain separate from a larger DMARC implementation if that is the appropriate scope.
How the engagement works
Start with a failed or misclassified message. Trace its path through authentication, DNS, routing and the platforms involved, then document the supported correction and any next decision.
Typical inputs
Affected domain, sender and recipient context, bounce, deferral or spam-placement behavior, the platform involved, and complete headers where available.
What you receive
A written diagnosis, supporting header or routing evidence, the recommended correction, and confirmation testing where implementation is included.
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
Messages work for some recipients but not others, a vendor integration introduced failures, legitimate mail began landing in spam, or a message authenticates successfully but does not align with the visible From domain.
Start with a failed or misclassified message.
Affected domain, sender and recipient context, bounce, deferral or spam-placement behavior, the platform involved, and complete headers where available.
Describe the delivery problem