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Warm-up puts a mailbox into a mutual network of real mailboxes that send to each other and reply, so it builds a sending reputation before you point campaigns at it.
Where
Email Accounts→row menu→Warm up
Your role needs
Read access to Warm-up read-warm-ups. Admin, Member and Viewer have it by default.
To create
create-warm-ups on top of the permission above.
Warm-up has no sidebar entry. You reach it from an email account’s row menu, from the bulk warm-up action, or by URL. If you cannot find this in your sidebar, your workspace may have a custom menu configuration. Contact support and we will check it for you.
The flame icon in the Warm-up column on Email Accounts opens a dialog for that one mailbox. On a mailbox with no warm-up it opens as Create Warm-up and starts with Warm-up Strategy, a set of presets that fill in the numbers for you. On a mailbox that already has one it opens as Manage Warm-up: no strategy presets, and a Delete warm-up button in the bottom-left corner. Everything between those two ends is the same either way: End Date, Reply Rate, Starting Volume, Daily Volume Increase and Daily Sending Goal.

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How it behaves

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Gmail and Google Workspace mailboxes are not warmed here

Google’s terms do not allow it, and the product says so in a blue Gmail/Google Workspace Notice above the warm-up list and above the create form. The create form’s mailbox list leaves Google accounts out, so there is nothing to pick there. Google warm-up policy covers what to send from instead.

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The percentage is about warm-up mail, not your campaigns

It is a deliverability reading: the share of a mailbox’s warm-up messages that landed in the inbox rather than being marked as spam. Campaign email is not part of it. Warm-up traffic is measured on its own. Where the reading comes from depends on the mailbox. When it is linked to a warm-up provider, the figure is the one that provider reports for it. When it is not, the app works one out from that mailbox’s own warm-up messages. Both lists show TBD instead of a number until there is something to show. A warm-up under a day old always reads TBD there, however busy it has been, and one whose reading comes back empty keeps reading TBD however old it is. Once there is a number, its colour is the quick version: green when delivery is strong, amber in the middle, red when it is weak. The standalone list at /warmup gives every warm-up its own row, with Sent Today and the same reading side by side.

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A warm-up has its own four states, not the mailbox’s status

This is the warm-up’s own lifecycle, separate from the mailbox’s Active, Paused or Error status. A mailbox keeps whatever status it already has for the whole time its warm-up runs. Pausing and resuming happen on the standalone list, and only in bulk: tick one or more rows and use Pause or Activate on the selection bar, which needs a role that can change warm-ups. There is no pause control on an individual row, and the flame’s dialog does not offer one either: it edits the volumes, the reply rate and the end date, and it can delete the warm-up, but it cannot pause or resume it. Past its quarantine, a mailbox that is not linked to a warm-up provider gets no calculated limit from Smart Daily Limit at all: the engine stops at that check, before it reads any deliverability, and leaves the stored limit alone. Starting a warm-up is what makes that link, on a platform where a warm-up provider is switched on. Inside the quarantine window the link makes no difference: an account Smart Limit is running on has a limit of 0 until the window closes, warm-up or no warm-up. Quarantine and ramp-up covers that first stretch.

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Every warm-up has a report page, and nothing links to it

There is no control anywhere in the product that opens it. The closest you get is Edit on a warm-up’s row, which puts that warm-up’s id in the address bar at /warmup/<id>; swap the end of the address for /view and you land on the report. It holds three cards: a Monthly Report bar chart of inbox against spam day by day, with a forecast of what is still to send; a Reply Rate ring against the target you set; and a Deliverability card that breaks the reading down by the mail provider on the receiving end, so you can tell landing well everywhere from struggling in one place. The note under that card names the target to aim for, and it is high. This is a figure you want near the top of its range, not merely out of the red.

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Limits

Start a warm-up

Pick a strategy and set the starting volume, daily increase, goal, reply rate and end date, for one mailbox or in bulk.

Google warm-up policy

Why Gmail and Google Workspace mailboxes are left out, and what to connect instead.

Smart Daily Limit

How a mailbox’s sending limit is calculated once its warm-up is linked to a provider.

Quarantine and ramp-up

Why a brand-new mailbox on Smart Limit sends no campaign email at all for its first weeks.