Scaling is not raising the limit from 50 to 500. It is adding mailboxes and domains in waves, rotating them, watching deliverability at every jump and having the capacity to answer. Skip a step and you scale straight into spam.
This guide assumes you have a proven message (at least 3% replies on the first 200 companies) and want ten times the volume.
First confirm the message works
Scale only once you have a decent reply rate on a small sample. Raising volume with bad copy only means wasting contacts faster.
Count on a cap per mailbox
Count on up to 50 cold emails a day per warmed-up mailbox. A target of 500 a day therefore means roughly ten mailboxes, ideally across several domains.
Add mailboxes in waves
Add new mailboxes continuously and let each one warm up. While they warm up, campaigns keep running on the existing ones.
Turn on rotation
The campaign then alternates mailboxes and spreads the volume on its own. You manage the total number, the system makes sure no address exceeds its cap.
Watch deliverability at every jump
After every volume increase watch bounces and open rate. If they worsen, step back and wait for the numbers to settle.
Don't forget reply capacity
Five hundred emails a day also means dozens of replies. Prepare who will handle them; an unanswered reply is worse than an unsent email.
- The message is proven on a small sample
- You plan for a ceiling of 30 to 50 emails per mailbox per day
- Mailboxes are added 3 to 5 at a time, each with warm-up
- The campaign rotates mailboxes across 2 to 3 domains
- After every volume jump you watch deliverability for a week
- You have capacity to answer 30 to 60 replies a week