Inbox warmup

Inbox warmup is the process of gradually increasing sending volume from a new email account to build a positive sender reputation before running campaigns at full scale.

Sending high volumes from a brand-new inbox immediately triggers spam filters — ISPs have no history to trust. Warmup solves this by starting slow and ramping up over 2–4 weeks.

How Stamina handles warmup

When Stamina provisions inboxes via DFY setup, warmup begins automatically within 24–72 hours. You don't need to configure, monitor, or intervene — it runs entirely in the background.

During warmup, Stamina:

• Sends a low volume of emails between warmed inboxes in a controlled network

• Generates positive engagement signals (opens, replies) to establish reputation

• Gradually increases daily volume over 2–4 weeks

When can I start sending campaigns?

Accounts are typically ready for campaign use after 2 weeks of warmup. Your GTM strategist will confirm when each inbox is ready to go. Starting campaigns before warmup is complete significantly increases the risk of landing in spam.

Warmup and campaigns running simultaneously

Once warmup is complete, campaigns run alongside the warmup process — Stamina continues sending warmup emails in the background to maintain reputation while campaigns send at full volume. You don't need to turn warmup off.