Professional services

Corporate email migration and DMARC enforcement

Mail ran on a legacy hosted mailbox service with no sender authentication. Outbound mail was landing in spam for some recipients, and the domain was being used in spoofed messages.

Environment

Legacy IMAP mailboxes with inconsistent client configuration
SPF record present but incomplete; no DKIM signing; no DMARC policy
Shared administrative credentials with no multi-factor authentication
No visibility into who was sending on behalf of the domain

Architecture

Tenant, domain and organisational structure defined before migration
Mail flow and routing rules mapped for every legitimate sending source
SPF corrected, DKIM signing enabled, DMARC introduced in monitoring mode
Conditional access and multi-factor authentication on administrative roles
Retention and external sharing policies aligned to business requirements

Implementation

Full inventory of applications and services sending as the domain
Staged mailbox migration with a pilot group and a defined rollback point
DMARC aggregate reports reviewed until all legitimate sources aligned
Policy moved from none to quarantine and then to enforcement in steps
Administrative roles reviewed and shared logins removed

Outcome

Legitimate mail is authenticated and aligned across all sending sources
Spoofed mail using the domain is rejected by receiving providers under enforcement
Administrative access is individual and protected by multi-factor authentication
Mail flow and policy are documented rather than held in one person's memory

Scope the work before you commit budget

Send the environment details and get an engineered proposal with assumptions, risks and a rollback path.

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