Hi team,
What is the maximum number of emails user can send per day? is it possible to limit the amount of email a mailbox can send per day?
Thanks for your help,
Hi team,
What is the maximum number of emails user can send per day? is it possible to limit the amount of email a mailbox can send per day?
Thanks for your help,
Please refer to the Sending limits in Exchange Online.
Sending limits apply to the number of recipients, number of messages, and number of recipients per message that a user can send from their Exchange Online account.

And several ways to set the limit introduced in this article: Setting Custom Recipient Limits for Exchange Online Mailboxes
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Setting a Custom Recipients Limit on a Mailbox, change it for all user mailboxes in the organization
Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSize Unlimited | Set-Mailbox -RecipientLimits 10
Update Mailbox Plans for New Mailboxes
Set-MailboxPlan ExchangeOnline -RecipientLimits 50
Organization Recipient Limits in the Anti-Spam Policy
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