check before: 2025-04-03
Product:
Exchange, Microsoft 365 admin center
Platform:
Online, World tenant
Status:
Change type:
Admin impact, Updated message
Links:
Details:
Summary:
New Exchange Online Tenant Outbound Email Limits (TERRL) will be introduced to reduce misuse and ensure service availability. TERRL restricts the number of external recipients a tenant can email daily, based on purchased email licenses. Enforcement starts in April 2025, with a phased rollout. Check EAC reports to monitor usage.
Details:
Updated April 21, 2025: We have updated the timelines below. Thank you for your patience.
To reduce the risk of misuse and abuse of Exchange Online resources and ensure service availability for all users, we'll soon introduce new tenant-level outbound email limits, known as the Tenant External Recipient Rate Limit or TERRL. The TERRL restricts the number of external recipients a tenant can send email to per day. If the limit is exceeded further messages sent to external recipients from the tenant will be blocked until the volume for the last 24 hours drops below the quota. A tenant's TERRL quota is calculated based on the number of email licenses a tenant has purchased. Here is the formula used to calculate a tenant's quota:
500 * (Purchased Email Licenses^0.7) + 9500
To help admins plan and track their outbound email volume, you'll find a new report in the Exchange admin center: EAC > Reports > Mail flow > Tenant Outbound External Recipients Rate. This report shows the current volume of external recipients, your tenant's daily quota, how much of the quota is used, and the number of recipients that were blocked if the limit was exceeded. The report will also show if enforcement for the limit is enabled or disabled. For example, for tenants who have more than 500 email licenses it will show "Disabled" until May 1st, the day we'll start to enable enforcement for tenants who have more than 500 licenses.
[When this will happen:]
This change will roll out in progressive stages over the month of March as per the following rollout schedule:
PhaseEnable enforcement for tenant groupRollout start date
1Tenants with <= 25 email licensesApril 3, 2025
2+ additional tenants with <= 200 licensesApril 18, 2025
3+ additional tenants with <= 500 licensesApril 28, 2025
4+ all remaining tenantsMay 9, 2025
Change Category:
XXXXXXX ... free basic plan only
Scope:
XXXXXXX ... free basic plan only
Release Phase:
Created:
2025-03-05
updated:
2025-04-22
Task Type
XXXXXXX ... free basic plan only
Docu to Check
XXXXXXX ... free basic plan only
MS How does it affect me
XXXXXXX ... free basic plan only
MS Preperations
XXXXXXX ... free basic plan only
MS Urgency
XXXXXXX ... free basic plan only
MS workload name
XXXXXXX ... free basic plan only
summary for non-techies**
Microsoft is implementing a Tenant External Recipient Rate Limit (TERRL) for Exchange Online starting April 2025, which limits the number of emails an organization can send to external recipients based on the number of email licenses, with additional emails being temporarily blocked once the limit is reached; organizations can track usage through a new report in the Exchange admin center and consider using Azure Communication Services for high-volume emails.
Direct effects for Operations**
Outbound Email Restrictions
Limiting the number of external recipients a tenant can email daily may disrupt communication with clients and partners, leading to potential business delays.
- roles: Email Administrators, Sales Representatives
- references: https://learn.microsoft.com/en-us/azure/communication-services/overview, https://techcommunity.microsoft.com/blog/exchange/introducing-exchange-online-tenant-outbound-email-limits/4372797
Increased Bounce Messages
Users will receive bounce messages when they exceed the email limit, causing confusion and frustration among staff trying to communicate externally.
- roles: End Users, Support Staff
- references: https://learn.microsoft.com/en-us/azure/communication-services/overview, https://techcommunity.microsoft.com/blog/exchange/introducing-exchange-online-tenant-outbound-email-limits/4372797
Need for Alternative Solutions
Organizations may need to adopt Azure Communication Services for high-volume emails, requiring additional training and adjustments to workflows.
- roles: IT Administrators, Marketing Teams
- references: https://learn.microsoft.com/en-us/azure/communication-services/overview, https://techcommunity.microsoft.com/blog/exchange/introducing-exchange-online-tenant-outbound-email-limits/4372797
Monitoring and Reporting Changes
Admins will need to frequently check new reports in the Exchange admin center to manage email limits, increasing their workload and potential for oversight.
- roles: Email Administrators, Compliance Officers
- references: https://learn.microsoft.com/en-us/azure/communication-services/overview, https://techcommunity.microsoft.com/blog/exchange/introducing-exchange-online-tenant-outbound-email-limits/4372797
User Experience Degradation
Frequent interruptions in email communication due to limit enforcement can lead to a negative user experience and decreased productivity.
- roles: End Users, Project Managers
- references: https://learn.microsoft.com/en-us/azure/communication-services/overview, https://techcommunity.microsoft.com/blog/exchange/introducing-exchange-online-tenant-outbound-email-limits/4372797
Configutation Options**
XXXXXXX ... paid membership only
Opportunities**
XXXXXXX ... free basic plan only
Potentional Risks**
XXXXXXX ... paid membership only
IT Security**
XXXXXXX ... paid membership only
explanation for non-techies**
XXXXXXX ... free basic plan only
** AI generated content. This information must be reviewed before use.
a free basic plan is required to see more details. Sign up here
A cloudsocut.one plan is required to see all the changed details. If you are already a customer, choose login.
If you are new to cloudscout.one please choose a plan.
change history
| Date | Property | old | new |
| 2025-04-22 | MC Messages | Updated March 10, 2025: We have updated the content. Thank you for your patience.
To reduce the risk of misuse and abuse of Exchange Online resources and ensure service availability for all users, we'll soon introduce new tenant-level outbound email limits, known as the Tenant External Recipient Rate Limit or TERRL. The TERRL restricts the number of external recipients a tenant can send email to per day. If the limit is exceeded further messages sent to external recipients from the tenant will be blocked until the volume for the last 24 hours drops below the quota. A tenant's TERRL quota is calculated based on the number of email licenses a tenant has purchased. Here is the formula used to calculate a tenant's quota: 500 * (Purchased Email Licenses^0.7) + 9500 To help admins plan and track their outbound email volume, you'll find a new report in the Exchange admin center: EAC > Reports > Mail flow > Tenant Outbound External Recipients Rate. This report shows the current volume of external recipients, your tenant's daily quota, how much of the quota is used, and the number of recipients that were blocked if the limit was exceeded. The report will also show if enforcement for the limit is enabled or disabled. For example, for tenants who have more than 500 email licenses it will show "Disabled" until May 1st, the day we'll start to enable enforcement for tenants who have more than 500 licenses. [When this will happen:] This change will roll out in progressive stages over the month of March as per the following rollout schedule: PhaseEnable enforcement for tenant groupRollout start date 1Tenants with <= 25 email licensesApril 3, 2025 2+ additional tenants with <= 200 licensesApril 10, 2025 3+ additional tenants with <= 500 licensesApril 17, 2025 4+ all remaining tenantsMay 1, 2025 | Updated April 21, 2025: We have updated the timelines below. Thank you for your patience.
To reduce the risk of misuse and abuse of Exchange Online resources and ensure service availability for all users, we'll soon introduce new tenant-level outbound email limits, known as the Tenant External Recipient Rate Limit or TERRL. The TERRL restricts the number of external recipients a tenant can send email to per day. If the limit is exceeded further messages sent to external recipients from the tenant will be blocked until the volume for the last 24 hours drops below the quota. A tenant's TERRL quota is calculated based on the number of email licenses a tenant has purchased. Here is the formula used to calculate a tenant's quota: 500 * (Purchased Email Licenses^0.7) + 9500 To help admins plan and track their outbound email volume, you'll find a new report in the Exchange admin center: EAC > Reports > Mail flow > Tenant Outbound External Recipients Rate. This report shows the current volume of external recipients, your tenant's daily quota, how much of the quota is used, and the number of recipients that were blocked if the limit was exceeded. The report will also show if enforcement for the limit is enabled or disabled. For example, for tenants who have more than 500 email licenses it will show "Disabled" until May 1st, the day we'll start to enable enforcement for tenants who have more than 500 licenses. [When this will happen:] This change will roll out in progressive stages over the month of March as per the following rollout schedule: PhaseEnable enforcement for tenant groupRollout start date 1Tenants with <= 25 email licensesApril 3, 2025 2+ additional tenants with <= 200 licensesApril 18, 2025 3+ additional tenants with <= 500 licensesApril 28, 2025 4+ all remaining tenantsMay 9, 2025 |
| 2025-04-22 | MC Title | New Exchange Online Tenant Outbound Email Limits | (Updated) New Exchange Online Tenant Outbound Email Limits |
| 2025-04-22 | MC Last Updated | 03/10/2025 18:19:30 | 2025-04-21T19:25:47Z |
| 2025-04-22 | MC MessageTagNames | Admin impact | Updated message, Admin impact |
| 2025-04-22 | MC Summary | New Exchange Online Tenant Outbound Email Limits (TERRL) will be introduced to reduce misuse and ensure service availability. TERRL restricts the number of external recipients a tenant can email daily, based on purchased email licenses. Enforcement starts in stages from April 3, 2025. Check the EAC report to monitor usage. | New Exchange Online Tenant Outbound Email Limits (TERRL) will be introduced to reduce misuse and ensure service availability. TERRL restricts the number of external recipients a tenant can email daily, based on purchased email licenses. Enforcement starts in April 2025, with a phased rollout. Check EAC reports to monitor usage. |
| 2025-03-11 | MC Messages | To reduce the risk of misuse and abuse of Exchange Online resources and ensure service availability for all users, we'll soon introduce new tenant-level outbound email limits, known as the Tenant External Recipient Rate Limit or TERRL. The TERRL restricts the number of external recipients a tenant can send email to per day. If the limit is exceeded further messages sent to external recipients from the tenant will be blocked until the volume for the last 24 hours drops below the quota. A tenant's TERRL quota is calculated based on the number of email licenses a tenant has purchased. Here is the formula used to calculate a tenant's quota:
500 * (Purchased Email Licenses^0.7) + 9500 To help admins plan and track their outbound email volume, you'll find a new report in the Exchange admin center: EAC > Reports > Mail flow > Tenant Outbound External Recipients Rate. This report shows the current volume of external recipients, your tenant's daily quota, how much of the quota is used, and the number of recipients that were blocked if the limit was exceeded. The report will also show if enforcement for the limit is enabled or disabled. For example, for tenants who have more than 500 email licenses it will show "Disabled" until March 31st, the day we'll start to enable enforcement for tenants who have more than 500 licenses. [When this will happen:] This change will roll out in progressive stages over the month of March as per the following rollout schedule: PhaseEnable enforcement for tenant groupRollout start date 1Tenants with <= 25 email licensesApril 3, 2025 2+ additional tenants with <= 200 licensesApril 10, 2025 3+ additional tenants with <= 500 licensesApril 17, 2025 4+ all remaining tenantsMay 1, 2025 | Updated March 10, 2025: We have updated the content. Thank you for your patience.
To reduce the risk of misuse and abuse of Exchange Online resources and ensure service availability for all users, we'll soon introduce new tenant-level outbound email limits, known as the Tenant External Recipient Rate Limit or TERRL. The TERRL restricts the number of external recipients a tenant can send email to per day. If the limit is exceeded further messages sent to external recipients from the tenant will be blocked until the volume for the last 24 hours drops below the quota. A tenant's TERRL quota is calculated based on the number of email licenses a tenant has purchased. Here is the formula used to calculate a tenant's quota: 500 * (Purchased Email Licenses^0.7) + 9500 To help admins plan and track their outbound email volume, you'll find a new report in the Exchange admin center: EAC > Reports > Mail flow > Tenant Outbound External Recipients Rate. This report shows the current volume of external recipients, your tenant's daily quota, how much of the quota is used, and the number of recipients that were blocked if the limit was exceeded. The report will also show if enforcement for the limit is enabled or disabled. For example, for tenants who have more than 500 email licenses it will show "Disabled" until May 1st, the day we'll start to enable enforcement for tenants who have more than 500 licenses. [When this will happen:] This change will roll out in progressive stages over the month of March as per the following rollout schedule: PhaseEnable enforcement for tenant groupRollout start date 1Tenants with <= 25 email licensesApril 3, 2025 2+ additional tenants with <= 200 licensesApril 10, 2025 3+ additional tenants with <= 500 licensesApril 17, 2025 4+ all remaining tenantsMay 1, 2025 |
| 2025-03-11 | MC Last Updated | 03/04/2025 19:56:40 | 2025-03-10T18:19:30Z |
| 2025-03-11 | MC Summary | New Exchange Online Tenant Outbound Email Limits (TERRL) will be introduced to restrict the number of external recipients a tenant can email daily. The limit is based on purchased email licenses. Enforcement starts in April 2025, with a phased rollout. Admins can track usage via a new report in the Exchange admin center. | New Exchange Online Tenant Outbound Email Limits (TERRL) will be introduced to reduce misuse and ensure service availability. TERRL restricts the number of external recipients a tenant can email daily, based on purchased email licenses. Enforcement starts in stages from April 3, 2025. Check the EAC report to monitor usage. |
Last updated 5 days ago
