Warmup is not a switch, it is a ramp.
Expected duration
Warmup typically runs two to four weeks and adjusts pace automatically based on engagement signals from the warmup network.
Do not push volume
Scale by adding mailboxes rather than by increasing volume on a single warming mailbox. Campaign traffic on a mailbox that has not finished warming is the fastest way to land in spam.
Continuous warmup
Warmup keeps running alongside campaign traffic once the mailbox is active — leaving it on protects reputation over time.
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