Exchange Server, Exchange Online, hybrid coexistence, mail flow, and email security handled by engineers who work in production environments.
The Exchange work documented on the site includes Exchange Online migration, Exchange on-premises to Exchange Online, hybrid coexistence, public folder migration and remediation, mail flow continuity, DNS cutover, shared mailboxes, distribution lists, and room resources.
For technical email authentication work, see DKIM, SPF, DMARC, and ARC for Exchange Online.