Warmup is Fuzegenai sending a small, growing volume of conversational mail from your mailbox to seed mailboxes and other mailboxes in the warmup pool, so inbox providers build a sending history for your address before your first campaign. How long it takes depends on how the mailbox performs, not on a fixed countdown.
Where you see it
On the Email Accounts page, the Status column shows the mailbox: WARMING, ACTIVE, INACTIVE or ARCHIVED. The Warmup column shows the warmup stage and the level, such as L3 — turn it on from the Columns menu, and hover it for the level detail. The Warmup page lists every sender with Status, Level, Daily Cap and Reputation.
Warmup also installs a provider-side filter, so warmup mail stays out of your normal inbox view.
The stages
- The domain's DNS records are checked first. A sender waits here until SPF, DKIM and DMARC resolve. See Set up SPF, DKIM, and DMARC for your domain.
- Warming up — the mailbox reads
WARMING. Warmup mail flows; campaign mail does not. - Ready, then maintenance — the mailbox reads
ACTIVEand can be used by campaigns. - Paused — the mailbox reads
INACTIVE. Nothing is sent from it.
A warming mailbox is never used for campaigns
Campaign sending only picks mailboxes whose status is ACTIVE. If every mailbox you selected for a campaign is still warming, the campaign list shows a Waiting on warmup badge: "All selected senders are still warming. Sending starts when warmup completes."
The ramp
| Level | Sends per day | Minimum days |
|---|---|---|
| 1 | 2 | 3 |
| 2 | 5 | 3 |
| 3 | 10 | 3 |
| 4 | 20 | 3 |
| 5 | 40 | 3 |
| 6 | 60 | 3 |
| 7 | 80 | top tier |
The minimum days are a floor, not a schedule. A level only advances once the mailbox has actually sent at that level and recent bounces and complaints are clean. Bounces or complaints in the last seven days hold it where it is.
Graduating
To leave warmup a sender has to reach the top level, earn a high enough reputation score, and show several days of inbox placement — on each provider it has been landing at, not just averaged across them. A mailbox that looks good on Gmail and poor on Outlook is held back.
If bounces or complaints spike badly, the sender is paused rather than pushed harder. It returns to warming once its reputation recovers.
Warmup keeps running afterwards
Graduation moves the sender into maintenance, not retirement. It stays ACTIVE and keeps a continuous floor of warmup traffic running alongside your campaigns, so the history does not go stale between sends and a quiet period does not cost you the reputation you built.
So how long?
There is no fixed answer, and be wary of anyone who gives you one. The ramp above is the fastest the app will go; poor bounce, complaint or placement signals stretch it. Watch the Level and Reputation on the Warmup page rather than counting days. Mailbox health and sender reputation explains what the score is built from, and the deliverability overview shows how warmup fits with the other checks.