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- 500 recipients per message.
- 10,000 recipients in any 24 hour window.
If you need to send mail to more than 1,000 addresses in one day which are not Dartmouth addresses, please contact the IT Service Desk (Help Desk) first. We will recommend other systems for doing this. If someone sends mail to thousands of addresses that are not at Dartmouth, many Internet service providers will block all mail coming from Dartmouth because it looks like we are allowing spam to be sent from our accounts. Use of these alternative tools prevents every account at Dartmouth from becoming blocked due to one account sending large amounts of mail.
More information can be found at Exchange Online Limits.