1. Limits for Personal/Home Outlook 365
300 emails per day,30 emails per minuteand up to 100 recipients per email.These limitations are stricter for new or flagged accounts. Find more detailed information here See Limits for Outlook 365 messages.https://www.msoutlook.info/question/235
2. Limits for Business/Enterprise10,000 emails per day30 emails per minute and 500 recipients per emailFind more detailed information here see recipient and sender limits. https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#RecipientLimits
3. Our SuggestionWe suggest to send around 50-100 emails per day. It’s important to be in their inbox not spam folder.Note: Recipients is different from emails – 1 email with 5 recipients’ counts as 5 emails, not 1.