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Hello, thanks for reaching out.
Are you sending to external addresses or only within Microsoft 365? Microsoft 365 Personal accounts have sending limits to reduce spam, including a daily limit of 300 emails.
Make sure all recipient addresses are valid, your account is not flagged for unusual activity, and your app or Outlook is up to date. Try sending smaller batches of emails under 10 recipients at a time.
You can also sign in at https://account.microsoft.com/services to check for notifications about sending limits or restrictions.