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Outlook / Office 365 Sending Limits

Microsoft's email service for personal and business use

300

Outlook.com Daily

10,000

M365 Business Daily

500

Recipients/Email

table_chart Detailed Limits by Plan

Plan Daily Limit Hourly Limit Recipients/Email
Outlook.com Free 300 30 100
Microsoft 365 Personal Paid 5,000 300 500
Microsoft 365 Business Basic Paid 10,000 500 500
Exchange Online Plan 1/2 Enterprise 10,000 500 500

warning Important Notes

  • arrow_right Limits are rolling 24-hour periods, not calendar days
  • arrow_right New accounts have stricter limits during the first 30 days
  • arrow_right External recipients have separate, lower limits than internal
  • arrow_right Bulk email may require using Exchange Online connectors

lightbulb Tips to Maximize Deliverability

  • check Use distribution groups for internal communications to save limits
  • check Consider Azure Communication Services for high-volume sending
  • check Set up SPF, DKIM, and DMARC for better deliverability
  • check Monitor your sending patterns to avoid hitting soft limits

Related Providers

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Gmail

Google's free email

 โœ‰๏ธ

Zoho Mail

Business email alternative

 โ˜๏ธ

Amazon SES

High volume sending

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SendGrid

Transactional email service

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