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.

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
120 comments
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Anonymous commented
Our organization would like to be able to increase the maximum recipient size to more than 1,000 recipients. Currently if you configure the setting at the mailbox level it says 0-1000 or unlimited. I tried to configure the unlimited and in powershell it says it is unlimited but it does not acknowledge this setting. This information needs to be modified or a larger amount should be allowed.
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Anonymous commented
We need to restrict sending mails above 50 users or 1000 user.that time it's rejected or sent any mail to global admin
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Anonymous commented
I understand the delay but to make it faster can you please add a cap on the max limit that can be specified cause in my case I don't want to increase but decrease the limit.
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Anonymous commented
Customizable limits would be good - so we could add some users to a Mail group than can send 500+ and other users such as students could be restricted to 100 recipients at a time.
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Anonymous commented
Scott - any update on creating a limit?
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Anonymous commented
we need to allow modified the amount of recipients urgent
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Mark commented
Urgently need to add the possibility to increase the amount of recipients per mail. In big organizations 500 is nothing. This limit actually risk the information chain in such a degree that it also risk the production line.
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Mudasir commented
I need one favor from your team to develop to modify a limitation in the Office 365 by PowerShell \GUI command to allow\deny.
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Victor Ivanidze commented
There exists a third-party tool that solves this problem. Google for RestrictExtRecips.
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Michael commented
This is now on the Microsoft 365 Roadmap, due in Q1 2020. https://www.microsoft.com/en-us/microsoft-365/roadmap?SilentAuth=1&rtc=1&filters=&searchterms=55025
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Paulo Machado commented
A minha organização tem um sistema híbrido e com a migração para Office 365 está a tornar-se complicado gerir o processo sem que haja a possibilidade de poder alterar estes limites de destinatários para alguns utilizadores:
- Na maior parte dos casos, porque queremos reduzir o número para limitar a possibilidade de spam para um elevado número de destinatários;
- Noutros casos de excepção pretendemos aumentar, uma vez que o Office 365 em modo híbrido considera as lista de distribuição que contenham utilizadores internos, como "fora da organização" e uma vez que a organização tem cerca de 1500 funcionários, é impossível que alguém envie uma notificação, por exemplo dos recursos humanos, para todos os funcionários.
Assim, pretendia-se abrir excepções através da configuração deste limite.Agradeço que sejam breves a permitir esta configuração.
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marco ibanez commented
is decreasing even an option?
you can actually decrease to 10 from 500 in the EAC and when refreshing the page the change does not revert....does it work? how do I do it for multiple users ? -
Anonymous commented
Please enable this feature
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Martin figueroa commented
In a enterprise environment this is a essential feature.
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Rahul Thakur commented
Yes, please enable this feature. This is to help with account compromises.
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Anonymous commented
Yes, please enable this feature. This is to help with account compromises.
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Anonymous commented
for reasons mentioned many many many times already.
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RD commented
We need to limit this to be consummate with the small size of our organization and the need to limit users from sending to lists that should be managed by our bulk mail process. It is more about user behavior, but compromised accounts etc. are also a concern. Hopefully this is implemented soon.
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Anonymous commented
A tendência é aumentar mais e mais envio de email, devido os documentos digital (nfe, cte, cupom fiscal...).
Já migramos nossos emails, que era servidor local, para office365 online com o objetivo do serviço está 24x7 ativo.
Com essa limitação de envio de email em massa, está cada vez mais complicado porque temos que ficar configurando serviço de email intermediário para envio de email em massa.
Sugestão é que a Microsoft disponibilizasse ao administrador do portal do office365 online alguma opção de configuração, para incluir determinada conta de email que poderá usar o serviço de envio de email em massa ou algum limite de envio de email para determinada conta. -
Anonymous commented
Need to limit external recipients for most of our workers as they have access to PII / HIPAA data and they can too easily export a customer list and email everyone on the list in one email. We have had close calls where people were CC'ed instead of BCC'ed. Need a mechanism to stop this.