Deliverability and infrastructure

Warmup

Definition

Warmup is gradually raising the daily send volume of a new mailbox or domain so mailbox providers see a normal history before it sends at full volume.

Warmup in practice

A brand new domain that sends hundreds of emails on day one looks like a spammer, because that is what spammers do. Warmup builds history slowly. Many teams use warmup tools that trade emails between real inboxes and mark them as important, while ramping real sends up over a few weeks.

Warmup is not a one time step. Most teams leave a warmup tool running at low volume alongside live campaigns, and cut volume back if bounce or spam complaint rates rise. Plan warmup time into any launch date: domains bought today are not ready to send today.

Plan warmup with the infrastructure calculator

Sending domainDomain reputationDeliverabilityInbox placementCold emailWarmup
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Last updated 2026-10-14 by Ishan Vats.

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See where warmup fits in a real build.

Book the free 30 minute signal audit. We map the buying signals for your ICP live on the call, and show you where warmup sits in the system we would build.

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  1. 01You talk. Who you sell to and what you send today.
  2. 02We map. The signals that fire for your ICP and the two to start with.
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Ishan Vats, founder of IV Consulting. We run our own outbound on the same system.

More free GTM tools: Signal library · Email domain checker · Cold email calculator · GTM glossary · GTM and CRM setup

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