Change Exchange Online recipient limit

Need to change Exchange online Recipient Limits. The default value is 500 and can't be modified.
In this case, users are able to send bulk\Spam messages by selecting entire global address list.

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Bruno Leonardo shared this idea · Sep 10, 2015 · Flag idea as inappropriate… · Admin →

boom! it's done ·

AdminScott Landry (Senior Program Manager, Microsoft Office 365) responded · Feb 28, 2020

See the public announcement here:
https://techcommunity.microsoft.com/t5/exchange-team-blog/customizable-recipient-limits-in-office-365/ba-p/1183228

You should also be aware that we improved Outbound Spam Policies to grant additional flexibility:
https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/configure-the-outbound-spam-policy?view=o365-worldwide

Show previous admin responses (3)

working on it ·

AdminScott Landry (Senior Program Manager, Microsoft Office 365) responded · Jul 30, 2019

We are working on customizable limits, but we have no ETA at this time. Thank you for the feedback.

thinking about it ·

O365 Compliance and Protection Feedback responded · Apr 13, 2018

Thank you for the feedback. Most of the comments here reflect a desire to be able to LOWER the recipient limit for a specific user. This is something we will consider as priorities allow. If you’re voting or commenting — we would be curious if this is driven more by account compromises or just user behavior (e.g., don’t have permissions to send to the DL, so the user just expands the DL)?

For issues with compromised accounts, we want you to be aware that we take this issue seriously and have been working on that problem from many angles. That said, we believe that limiting the number of recipients per email will not stop or even slow the bad guys significantly. Instead, we encourage you to visit https://securescore.office.com/ and implement best practices to protect your organization.

For any comments regarding other issues with limits or throttling (e.g., increasing a limit), please start NEW items and please be clear what the scenario is that you need to support and why. Limits are a necessary piece of any email service, but we don’t want them to be obtrusive and block valid business scenarios.

thinking about it ·

O365 Compliance and Protection Feedback responded · Mar 15, 2017

Thank you for the feedback. Most of the comments here reflect a desire to be able to LOWER the recipient limit for a specific user. This is something we will consider as resources allow. We would be curious if this is driven more by account compromises or just user behavior (e.g., don’t have permissions to send to the DL, so the user just expands the DL)?

For any comments regarding other issues with limits or throttling, please start NEW items and please be clear what the scenario is that you need to support and why. Limits are a necessary piece of any email service, but we don’t want them to be obtrusive and block valid business scenarios.

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