Email providers track sender behavior at the mailbox, domain, and IP level.
Sending too many emails too quickly from a single inbox is one of the fastest ways to trigger spam filters.
To protect inbox placement and long-term reputation, sending limits are intentionally conservative.
The goal is simple:
Stay in the inbox
Maintain high reply rates
Avoid burning domains or mailboxes
Maximum outreach emails per mailbox per day: 15
This is a strict upper bound. Sending beyond this significantly increases spam risk.
Ideal outreach volume: 10 emails per mailbox per day
This range consistently delivers:
Better inbox placement
Higher open rates
Stronger reply rates
If you want to send more emails overall, the correct way to scale is more mailboxes, not higher per-mailbox volume.
Warmup emails are designed to build trust with email providers by simulating natural conversations.
Warmup emails per mailbox per day: Up to 20
Typical reply rate: 30% to 50%
Warmup emails are separate from outreach emails
Warmup emails do not count toward your outreach limits.
Each new mailbox should be warmed up gradually before sending full outreach.
Week 1
5 to 10 warmup emails per day
Focus: Initial trust building
Week 2
10 to 15 warmup emails per day
Focus: Consistency and engagement
Week 3
20 warmup emails per day
Focus: Stabilizing reputation
After week 3, the mailbox is considered ready for outreach.
Once warmup is complete:
Keep warmup running in the background
Start outreach gradually
Never exceed 15 outreach emails per mailbox per day
For best results, stay close to 10 outreach emails per mailbox per day
This balanced approach keeps sender reputation healthy while allowing steady scale.
Do not scale by increasing per-mailbox volume
Scale by adding more mailboxes and domains
Example:
10 mailboxes × 10 outreach emails = 100 emails/day
50 mailboxes × 10 outreach emails = 500 emails/day
Same safe behavior. Higher total volume.
Max outreach per mailbox: 15 emails/day
Recommended outreach: 10 emails/day
Warmup emails: Up to 20/day
Warmup duration: 3 weeks
Scaling should always be done by adding mailboxes, not pushing inboxes harder
This approach maximizes deliverability, protects domains, and drives sustainable reply rates over time.
