Sending Limits
Maximum number of emails you can send per time period, set by your email provider and best practices.
What is Sending Limits?
Sending limits are restrictions on how many emails you can send in a given time period. They exist at multiple levels:
Provider limits (Microsoft 365):
- 10,000 recipients per day per tenant
- 30 messages per minute (rate limit)
Safe sending limits (best practice):
- 20-25 emails per domain per day
- Spread throughout business hours
- Gradual ramp-up for new domains
Why safe limits are lower than provider limits: Provider limits are maximums that won't get your account suspended. But exceeding safe limits damages domain reputation even if providers allow it.
A new domain sending 500 emails/day isn't breaking rules - but it's exhibiting spam-like behavior that hurts deliverability.
Our approach: We enforce 20 emails/domain/day after warmup. Want more volume? Add more domains.
Why It Matters
- 1Exceeding safe limits damages reputation
- 2Provider limits don't equal safe limits
- 3More domains = more safe capacity
- 4Spread sending to avoid burst patterns
Related Guides
Related Terms
Ready to Start Your Cold Email Campaign?
We handle the technical details - authentication, warmup, deliverability - so you can focus on writing emails that convert.