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Email: Office 365 Sending Limits
Office 365 email does have a limit to the number of email messages that can be sent at a single time.
Hard Sending Limits for Office 365:
- 10,000 recipients per day
- 500 recipients per message
A potential work around to the 500 recipient limit per message is to do a mail merge. In a mail merge Office 365 sees each recipient as a separate message, however the 10,000 limit per day still applies. For instructions on how to do a mail merge, see the following Microsoft article.
For a full list of Office 365 email limitations please see the following Microsoft article.