---
title: Exchange Online – Enforcing receiving email limit - cubesys
description: As you know Exchange Online has some limits in place to ensure performance and stability of the service (see https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits to know more about).As part of these limits, there is one restricting the number of emails received per hour – set to 3600 emails (see https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#receiving-and-sending-limits).Starting April 2021 this limit…
---

[Latest News & Blogs - cubesys ](https://www.cubesys.com.au/blog)

# [Exchange Online – Enforcing receiving email limit - cubesys](https://www.cubesys.com.au/blog/exchange-online-enforcing-receiving-email-limit)

 Written by [cubesys](https://www.cubesys.com.au/blog/author/cubesys) | Feb 14, 2021 1:00:00 PM

As you know Exchange Online has some limits in place to ensure performance and stability of the service (see [https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits](https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits) to know more about).

As part of these limits, there is one restricting the number of emails received per hour – set to 3600 emails (see [https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#receiving-and-sending-limits](https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#receiving-and-sending-limits)).

Starting **April 2021** this limit will be enforce.

This means if you have mailboxes receiving more than 3600 email per hour, these mailboxes will stop receiving emails and get a throttling notification email while senders will get a Non Delivery Report (NDR) until the threshold is reset 1 hour **after it has been exceeded**.

Exchange administrators will be able to review if mailboxes are impacted by this enforcement using the new **Mailbox exceeding receiving limits** report in Exchange administration portal.

When one or more mailboxes in your organization hit the receiving limit, an insight titled “**Some mailboxes need attention: one or more mailboxes have exceeded their receiving limits**” will appear in the dashboard.

<https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-133.png>

[View full post](https://www.cubesys.com.au/blog/exchange-online-enforcing-receiving-email-limit)

```json
{
  "@context" : "http://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "cubesys"
  },
  "dateModified" : "2025-02-21T15:53:18.383Z",
  "datePublished" : "2021-02-14T13:00:00Z",
  "headline" : "Exchange Online – Enforcing receiving email limit",
  "image" : {
    "@type" : "ImageObject",
    "height" : 60,
    "url" : "/hs/hsstatic/content_shared_assets/static-1.4092/img/default-amp-logo.png",
    "width" : 60
  },
  "mainEntityOfPage" : "https://www.cubesys.com.au/blog/exchange-online-enforcing-receiving-email-limit",
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "height" : 60,
      "url" : "/hs/hsstatic/content_shared_assets/static-1.4092/img/default-amp-logo.png",
      "width" : 60
    },
    "name" : "Latest News"
  }
}
```