Microsoft Enforce Usage Rules for Office 365
Microsoft Enforce Usage Rules for Office 365March, 2023
Microsoft imposes fair usage limitations when sending emails via O365
Looking at some of Microsoft’s O365 sending rules; emails can be throttled after 30 emails are sent in one minute or the limit of 10,000 total recipients in a day. Both can come into play if you send several thousand statements at the end of the month, or even if you are only sending 60-70 invoices within 30 minutes.
Although Formate eVo can help with a number of tools to help overcome this, we felt that you should be aware of Microsoft’s limits and views on the subject. (For instance, Formate eVo can be used to set minimum send intervals and daily email quotas can be used to try to throttle sending speeds. Additionally, Formate eVo can limit the number of emails sent in a day or create multiple connections to address these issues).
Microsoft imposes the following limits as standard (although we find that the application of enforcement is more variable than defined here). Some limits are hard and some are more flexible:
The table above thanks to a Microsoft article (Linked to here)
Microsoft suggests setting up and using authenticated SMTP, with an application password, as a solution – this should still save the email to sent items (Formate eVo v23 will have support for MS Authenticated SMTP connections).
For full details and some options see the links below:
Exchange Online limits – Service Descriptions | Microsoft Learn
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