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Problem

What is the maximum number of recipients I can message using Outlook?

Solution

The default number of allowed recipients in Office 365 is 500. For accounts that need to send larger batches of emails, we now have the ability to raise the limit and send to 1000 recipients. A ticket would need to be put in to request this recipient limit change. This is regardless of whether the addresses are listed individually, or in a distribution list you've created. There is also a hard limit of only being able to mail 10,000 recipients a day.

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