Free tool

Email warm-upschedule planner.

Plan a new mailbox's first four weeks, day by day: two weeks of warm-up only, then campaigns building up to full volume, the way mailzy paces it.

Use the tool How to read it

How it works

Set your daily goalCampaign emails per mailbox
See the scheduleWarm-up and campaign, each day
Start on day 15Full volume by day 21

Free, no sign-up. Runs in your browser. Nothing you type is sent anywhere.

Your new mailboxes

Campaign emails per mailbox a day, once warmed

30 is the safe number; the planner caps it at 50.

How many mailboxes

The plan in short

Warm-up onlyDays 1-14

Full campaign volumeDay 21

Campaign emails a day, all mailboxes90

Warm-up keeps running10 a day each

This is the pace mailzy runs automatically: warm-up starts at 5 a day and climbs 5 a day to 40, then eases to 10 while campaigns run.

Day by day, per mailbox

Day	Warm-up emails	Campaign emails	Total
1	5	-	5	Warm-up starts. No campaign email yet.
2	10	-	10
3	15	-	15
4	20	-	20
5	25	-	25
6	30	-	30
7	35	-	35
8	40	-	40	Warm-up at full pace.
9	40	-	40
10	40	-	40
11	40	-	40
12	40	-	40
13	40	-	40
14	40	-	40	Two weeks: check health and inbox placement.
15	10	4	14	Campaigns start, gently.
16	10	9	19
17	10	13	23
18	10	17	27
19	10	21	31
20	10	26	36
21	10	30	40	Full campaign volume.
22	10	30	40
23	10	30	40
24	10	30	40
25	10	30	40
26	10	30	40
27	10	30	40
28	10	30	40

How warm-up works.

What the result means, and how to fix what it finds.

What warm-up is

A new mailbox has no sending history, and inbox providers distrust mailboxes with no history that suddenly send a lot. Warm-up sends emails between real mailboxes that open them, reply to them and move them out of spam. That builds a record of normal, wanted email before your campaigns start.

Two weeks before campaigns

The plan starts at 5 warm-up emails a day and adds 5 a day up to 40. That's the pace mailzy uses automatically for every new mailbox. For those first 14 days the mailbox sends no campaign email at all: its only job is to build a reputation.

Then campaigns, gently

From day 15, warm-up eases to 10 a day and campaign email starts small, rising to your full daily number over a week. Warm-up keeps running in the background for as long as the mailbox sends campaigns, so a bad day doesn't undo its reputation.

Watch the signals

Before raising volume, check the mailbox's health and its spam rate. If warm-up emails are landing in spam, slow down and look at the domain's setup with our Domain Health Checker. A mailbox that's healthy at day 14 can go to full volume; one that isn't needs more time.

What good warm-up looks like

Healthy warm-up shows a few signs. Warm-up emails land in the inbox, not spam or promotions, most of the time. The mailbox's health score climbs over the first two weeks and stays high. And there are no sudden drops after you start campaigns. If warm-up emails start landing in spam, don't push on: lower the volume, check the domain's SPF, DKIM and DMARC, and look for a blocklist listing. A mailbox that has been in trouble needs another week or two of warm-up only before it carries campaigns again. Patience here is cheaper than a new domain.

In mailzy