Infrastructure recipe
Sending within the week, prewarmed
The fastest route to a working fleet, and what "prewarmed" does and does not remove.
1,000 sends a day needs 219 inboxes across 17 domains, costing $490 a month — prewarmed, sized for a list that is 50% Google, 30% Microsoft and 20% other. That is 22,220 sends a month across 22 sending days.
The pools
- Google Workspace — 650 sends/day from 44 inboxes across 15 domains, at 15/day each and 3 per domain. $352/month.
The Google half of the list, plus the unmatched remainder - Azure — 350 sends/day from 175 inboxes across 2 domains, at 2/day each and 100 per domain. $138/month.
The Microsoft third
Right for
A campaign with a date on it. The warmup already happened before you ordered, so the only wait is delivery and connection.
Wrong for
Anyone who wants their own branded domains on day one. Prewarmed inboxes come on domains that have the history — that history is the product, and it cannot be transferred onto a domain you registered last week.
In the sequencer
Connect, verify authentication on every domain, send a small volume on day one and climb. A prewarmed mailbox has reputation; a prewarmed mailbox that suddenly sends 15 a day from a standing start still looks like a change in behaviour.
Why these numbers
Prewarmed removes the warmup wait, not the delivery time. The inboxes land within 48 to 72 hours like any other order, and you can send as soon as they do — which is the honest version of "start sending immediately".
What you are buying is age and sending history on a domain, which is exactly the thing a fresh domain cannot have at any price. That is also why these come on our domains rather than yours.
Check the authentication before the first send rather than after. A fleet that arrives correct can still be broken by a tracking domain pointed at the wrong place.
No reserve capacity is included beyond rounding up. Measure your own recipient mix →