Instantly Email Warmup automatically exchanges emails among accounts in a private network the vendor reports at more than one million mailboxes, so participating sending addresses accumulate positive engagement signals. It ramps volume gradually from a small number of daily messages upward, which imitates organic sending behavior rather than a sudden campaign burst.

A deliverability dashboard reports inbox versus spam placement and an overall deliverability score so teams can judge when an account is ready to send. The warmup emulates human reading behavior and lets users configure the open and response rates for the messages it sends on their behalf.