Why Microsoft 365 Limits Bulk Email – and What Your Business Can Do Instead

Trying to send a mass email through Microsoft 365 and getting blocked? You’re not alone—and it’s not a bug. Microsoft places strict limits on bulk email to prevent spam, protect your sender reputation, and keep their platform secure.

Why the Limits Exist

Microsoft 365 is built for business communication, not email marketing. It’s meant for one-to-one messages, not sending 1,000+ emails at once. Here’s why they limit bulk sends:

• 🛡️ Security: Stops spammers and protects against compromised accounts.

• 📬 Deliverability: Keeps Microsoft’s servers off blocklists.

• ⚖️ Compliance: Helps you stay within anti-spam laws like CAN-SPAM and GDPR.

Microsoft 365 Email Limits (by default):

• 10,000 recipients per day

• 500 recipients per email

• 30 messages per minute

Go over those, and your account could be throttled or even blocked.

What to Use Instead

For newsletters, marketing, or large-scale announcements, use a dedicated platform like:

• Mailchimp

• SendGrid

• Constant Contact

• Or Microsoft’s own Dynamics 365 Marketing

These tools are designed to handle bulk messages and protect your domain reputation.

Let Veith Technologies Help

At Veith Technologies, we help businesses:

• Set up the right email tools

• Stay compliant and protected

• Improve deliverability and engagement

Need to send bulk emails the right way?📞 Let Veith Technologies build a better solution for your business.