check before: 2026-03-01
Product:
Exchange, Microsoft 365 admin center
Platform:
Online, World tenant
Status:
Rolling out
Change type:
Admin impact, New feature, Updated message, User impact
Links:
Details:
Summary:
Microsoft 365 introduces High Volume Email (HVE) for large-scale internal communications, available now with general availability completing April 2026. HVE offers dedicated SMTP endpoints, new admin controls, and reporting, with metered billing starting June 1, 2026. It is opt-in and does not affect existing limits.
Details:
Updated March 31, 2026: We have updated the content. Thank you for your patience.
[Introduction]
Exchange Online includes email‑sending limits based on three factors: recipient rate limit, recipient limit, and message rate limit. To support customers whose internal communication needs exceed these standard limits, we are introducing High Volume Email (HVE) for Microsoft 365. HVE is designed for large‑scale internal communications and integrates with business applications and devices to support operational and mass‑mailing scenarios. It uses a transactional pricing model based on the number of recipients.
HVE is currently available at no additional cost, with metered billing starting June 1, 2026. Pricing information is now published. For more information, see High Volume Email Is Now Available in Exchange Online.
This message is associated with Microsoft 365 Roadmap ID 382633.
[When this will happen]
Public Preview: Available now.
General Availability (worldwide): Rolling out now and rollout is expected to complete early April 2026.
Change Category:
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Scope:
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Release Phase:
General Availability, Preview
Created:
2026-03-04
updated:
2026-04-01
Public Preview Start Date
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Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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linked item details
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Pictures
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summary for non-techies**
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Direct effects for Operations**
High Volume Email Implementation
Without proper preparation, the introduction of High Volume Email (HVE) may lead to confusion among users regarding new email sending limits and processes, potentially resulting in miscommunication or delays in internal communications.
- roles: Exchange Admin, End Users
- references: https://learn.microsoft.com/exchange/mail-flow-best-practices/high-volume-mails-m365, https://techcommunity.microsoft.com/blog/microsoft_365blog/high-volume-email-is-now-available-in-exchange-online/4505302
Billing and Cost Management
The transition to a metered billing model starting June 1, 2026, without prior preparation may lead to unexpected costs for organizations that do not monitor their HVE usage effectively, impacting budget planning and financial management.
- roles: Finance Manager, Exchange Admin
- references: https://learn.microsoft.com/exchange/mail-flow-best-practices/high-volume-mails-m365, https://www.microsoft.com/microsoft-365/roadmap?searchterms=382633#Roadmap
Configutation Options**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-04-01 | MC Messages | Updated March 12, 2026: We have updated the content. Thank you for your patience.
[Introduction] Exchange Online includes email‑sending limits based on three factors: recipient rate limit, recipient limit, and message rate limit. To support customers whose internal communication needs exceed these standard limits, we are introducing High Volume Email (HVE) for Microsoft 365. HVE is designed for large‑scale internal communications and integrates with business applications and devices to support operational and mass‑mailing scenarios. It uses a transactional pricing model based on the number of recipients. HVE is available at no additional cost during Public Preview. Pricing for General Availability (GA) will be announced with the GA release, and billing will begin in June 2026 following a free promotional period after GA in March 2026. This message is associated with Microsoft 365 Roadmap ID 382633. [When this will happen] Public Preview: Available now. General Availability (worldwide): Rollout begins in late March 2026 and is expected to complete early April 2026. | Updated March 31, 2026: We have updated the content. Thank you for your patience.
[Introduction] Exchange Online includes email‑sending limits based on three factors: recipient rate limit, recipient limit, and message rate limit. To support customers whose internal communication needs exceed these standard limits, we are introducing High Volume Email (HVE) for Microsoft 365. HVE is designed for large‑scale internal communications and integrates with business applications and devices to support operational and mass‑mailing scenarios. It uses a transactional pricing model based on the number of recipients. HVE is currently available at no additional cost, with metered billing starting June 1, 2026. Pricing information is now published. For more information, see High Volume Email Is Now Available in Exchange Online. This message is associated with Microsoft 365 Roadmap ID 382633. [When this will happen] Public Preview: Available now. General Availability (worldwide): Rolling out now and rollout is expected to complete early April 2026. |
| 2026-04-01 | MC Title | (Updated) High Volume Email for Microsoft 365 upcoming general availability | (Updated) High Volume Email for Microsoft 365 now generally available |
| 2026-04-01 | MC Last Updated | 03/12/2026 17:02:03 | 2026-03-31T18:51:43Z |
| 2026-04-01 | MC prepare | No action is required to prepare for this change.
You may want to: Review and update any internal documentation that describes email‑sending processes. Learn more about setup and configuration: Manage high volume emails for Microsoft 365 Public preview | Mail flow best practices | Exchange Online | Microsoft Learn [Compliance considerations] No compliance considerations identified. Review as appropriate for your organization. https://learn.microsoft.com/exchange/mail-flow-best-practices/high-volume-mails-m365 https://www.microsoft.com/microsoft-365/roadmap?searchterms=382633#Roadmap | No action is required to prepare for this change.
You may want to: Review and update any internal documentation that describes email‑sending processes. Learn more about setup and configuration: Manage high volume emails for Microsoft 365 Public preview | Mail flow best practices | Exchange Online | Microsoft Learn [Compliance considerations] No compliance considerations identified. Review as appropriate for your organization. https://learn.microsoft.com/exchange/mail-flow-best-practices/high-volume-mails-m365 https://techcommunity.microsoft.com/blog/microsoft_365blog/high-volume-email-is-now-available-in-exchange-online/4505302 https://www.microsoft.com/microsoft-365/roadmap?searchterms=382633#Roadmap |
| 2026-04-01 | MC Summary | Microsoft 365 introduces High Volume Email (HVE) for large-scale internal communications, available now in Public Preview and rolling out globally in March 2026. HVE offers dedicated SMTP endpoints, opt-in management via Exchange admin center, and new reporting, with pricing starting post-free promotional period in June 2026. | Microsoft 365 introduces High Volume Email (HVE) for large-scale internal communications, available now with general availability completing April 2026. HVE offers dedicated SMTP endpoints, new admin controls, and reporting, with metered billing starting June 1, 2026. It is opt-in and does not affect existing limits. |
| 2026-03-17 | MC Messages | [Introduction]
Exchange Online includes email‑sending limits based on three factors: recipient rate limit, recipient limit, and message rate limit. To support customers whose internal communication needs exceed these standard limits, we are introducing High Volume Email (HVE) for Microsoft 365. HVE is designed for large‑scale internal communications and integrates with business applications and devices to support operational and mass‑mailing scenarios. It uses a transactional pricing model based on the number of recipients. HVE is available at no additional cost during Public Preview. Pricing for General Availability (GA) will be announced with the GA release, and billing will begin in May 2026 following a free promotional period after GA in March 2026. This message is associated with Microsoft 365 Roadmap ID 382633. [When this will happen] Public Preview: Available now. General Availability (worldwide): Rollout begins in late March 2026 and is expected to complete early April 2026. | Updated March 12, 2026: We have updated the content. Thank you for your patience.
[Introduction] Exchange Online includes email‑sending limits based on three factors: recipient rate limit, recipient limit, and message rate limit. To support customers whose internal communication needs exceed these standard limits, we are introducing High Volume Email (HVE) for Microsoft 365. HVE is designed for large‑scale internal communications and integrates with business applications and devices to support operational and mass‑mailing scenarios. It uses a transactional pricing model based on the number of recipients. HVE is available at no additional cost during Public Preview. Pricing for General Availability (GA) will be announced with the GA release, and billing will begin in June 2026 following a free promotional period after GA in March 2026. This message is associated with Microsoft 365 Roadmap ID 382633. [When this will happen] Public Preview: Available now. General Availability (worldwide): Rollout begins in late March 2026 and is expected to complete early April 2026. |
| 2026-03-17 | MC Title | High Volume Email for Microsoft 365 upcoming general availability | (Updated) High Volume Email for Microsoft 365 upcoming general availability |
| 2026-03-17 | MC Last Updated | 03/04/2026 02:28:09 | 2026-03-12T17:02:03Z |
| 2026-03-17 | MC MessageTagNames | New feature, User impact, Admin impact | Updated message, New feature, User impact, Admin impact |
| 2026-03-17 | MC Summary | Microsoft 365 is introducing High Volume Email (HVE) for large-scale internal communications, available now in Public Preview and generally available March 2026. HVE offers dedicated SMTP endpoints, new admin controls, and reporting, with a transactional pricing model starting May 2026 after a free promotional period. | Microsoft 365 introduces High Volume Email (HVE) for large-scale internal communications, available now in Public Preview and rolling out globally in March 2026. HVE offers dedicated SMTP endpoints, opt-in management via Exchange admin center, and new reporting, with pricing starting post-free promotional period in June 2026. |
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