Organizations that rely on Exchange Online for internal communications have long needed a way to send large volumes of automated messages, such as payroll notifications, IT alerts, and security advisories, without running into the sending limits designed for person-to-person email. Microsoft has addressed that with the general availability of High Volume Email (HVE) in Exchange Online.
What High Volume Email does
HVE is a tenant-native capability built for application-to-person messaging within an organization. It uses dedicated HVE accounts separate from user or shared mailboxes, which keeps automated email traffic isolated from standard human communication workflows.
Mail sent through HVE stays within Microsoft infrastructure and falls under Exchange Online’s existing security, compliance, and policy controls. Administrators configure and manage the service directly in the Exchange admin center under the Mail flow section.
Intended use cases
HVE is designed for transactional and operational messaging to internal recipients. Microsoft lists the primary use cases as payroll and HR system notifications, IT monitoring and service alerts, line-of-business application messaging, device-driven workflows such as those from printers and scanners, and security and compliance notifications.
“It does not include campaign tooling, templates, or engagement tracking. Instead, it supports the high‑trust, high‑reliability use cases that organizations depend on every day,” Jeremy Carlson, Director of Product Marketing, M365 Portfolio Growth at Microsoft, wrote in a blog post.
Pricing and availability
HVE is available now. Usage will be metered starting June 1, 2026, based on the number of expanded email recipients. Microsoft has set the price at $42 per one million recipients through Microsoft commerce, which works out to $0.000042 per recipient.
The pricing model is based on recipient count, aligning the cost structure with the volume of internal email sent through the service.
Infrastructure implications
For organizations that have relied on on-premises Exchange servers, third-party SMTP relay services, or repurposed user mailboxes to handle high-volume automated email, HVE offers a path to consolidate that traffic into Microsoft 365. Deploying HVE does not require new infrastructure or third-party dependencies, since it runs natively within an existing Exchange Online tenant.
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