Definition
Warmup is the process of sending a small, steadily growing number of emails from a new mailbox so inbox providers see it as legitimate before it starts cold campaigns.
Why it matters
Every new mailbox starts with zero reputation. Skipping warmup is the fastest way to hit spam and burn a domain within days.
How it works
- Connect the new mailbox to a warmup network
- Send a slowly growing number of emails per day for 2 to 4 weeks
- Warmup emails are auto opened and replied to by other warmup mailboxes
- Only run real cold campaigns after reputation stabilizes
Want us to run this for you?
Lead Engine builds outbound engines for B2B teams. Cold calling, cold email, and appointment setting, run by US based reps.