Email send limit exceeds for tenant need email alerts before reach the limit

adminofsense 0 Reputation points
2026-10-06T13:25:00.2666667+00:00

Hi All

i would like to receive email alerts before i reach my tenant send email limit to outbound external recipients but not being able to find out such feature in Exchange online admin center.

Please let me know if i can receive these alerts through emails.

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

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  1. Alina Le 5,585 Reputation points Independent Advisor
    2026-10-06T14:42:50.4866667+00:00

    Hello

    Unfortunately, Exchange Online does not currently provide a built-in email alert before the Tenant External Recipient Rate Limit (TERRL) is reached. Administrators are only notified after the limit has been exceeded and message delivery is affected.

    At the moment, the most practical approach is to regularly review the tenant's usage in Exchange Admin Center > Reports > Mail flow > Tenant Outbound External Recipients, or implement a custom monitoring solution that sends notifications when usage reaches a predefined threshold.

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  2. AI answer

    2026-10-06T13:25:14.7866667+00:00

    Yes. Email alerts are available for outbound sending limits.

    For the tenant external recipient limit, the built-in alert policy Email sending limit exceeded can notify the TenantAdmins group by email. The alert policies are enabled by default and can be reviewed or modified in the Microsoft Defender portal on the Alert policy page.

    A practical setup is:

    1. Open the Microsoft Defender portal.
    2. Go to Alert policy.
    3. Find Email sending limit exceeded.
    4. Review or modify the notification settings so the required admins receive the email alerts.

    To monitor how close the tenant is to the Tenant External Recipient Rate Limit (TERRL), use:

    • Exchange admin center > Reports > Mail flow
    • Tenant Outbound External Recipients report

    That report shows TERRL usage for the organization.

    If alerts are needed before the limit is reached, Microsoft recommends creating a custom alert policy, for example at 80% of TERRL, so there is time to redistribute sending or move bulk/high-volume external email to another service.

    For bulk or high-volume external email, the recommended alternative is Azure Communication Services email.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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