Outlook Email Limits:
- Daily recipients: 500
- Maximum recipients per message: 50 for students (500 for staff and faculty)
- Internal recipients per hour for students: 50
- External recipients per hour for students: 50
- Daily non-relationship recipients: 1,000
File Attachment Size Limit in Outlook:
- The attachment size limit for files is 25 MB.
- You can also share a file from OneDrive. This way, your recipients can receive larger files and collaborate in real time. The attachment size limit for OneDrive files is 2GB.
Note: For the purposes of the recipient rate limit and the recipient limit, a distribution group that is stored in the organization's shared address book counts as one recipient.
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