An email warm up tool ramps a new mailbox from a handful of messages a day to full volume so Gmail and Outlook learn it is a real sender before your first campaign. The free planner below builds that day-by-day schedule, tells you when you can start sending for real, and how many mailboxes you need for your target volume.
Email warm-up schedule planner
| Day | Date | Each | All | Total |
|---|
Nothing you type is stored or sent anywhere; the planner runs in your browser.
How to use the email warm up planner
Enter how many mailboxes you are warming, where to start, how fast to climb, and the daily volume each mailbox should carry once warm. Add the campaign volume you need and the planner tells you how many mailboxes that takes. Tick "Skip weekends" if you only send on business days, then copy the schedule.
How it works: the method behind the schedule
The planner is arithmetic you can check.
- Linear ramp: volume on day d = start + (d − 1) × increase, capped at the target.
- Percentage ramp: volume on day d = start × (1 + rate)d − 1, rounded, capped at the target. If rounding would repeat a day, the planner adds one.
- Days to target: the first day the per-mailbox volume reaches the target.
- Warm-up emails sent: the sum of daily volumes through the day you hit target, times mailboxes.
- Mailboxes needed: campaign emails per day ÷ target per mailbox, rounded up.
- Earliest campaign start: the sending day after the first day at full volume.
The ramp rule comes from Google's Email sender guidelines: "Start with a low sending volume to engaged users, and slowly increase the volume over time," send "at a consistent rate" and avoid "sudden volume spikes." The same page sets the rule every warm-up protects: keep the spam rate in Postmaster Tools below 0.10% and never reach 0.30%.
Provider hard limits sit far above any sensible warm-up target. Google Workspace allows 2,000 messages per user per day (500 for trial accounts), with 3,000 external recipients per day; personal Gmail stops you at 500 emails in a day; Exchange Online enforces 10,000 recipients per day and 30 messages per minute. Hitting those ceilings is not the risk; getting flagged as spam at 80 a day from a two-week-old mailbox is. That is why the planner defaults to 30 and warns above 50: the cap is a cold-email convention, not a provider rule, and it keeps complaint and bounce rates low while reputation is thin.
A worked example with real arithmetic
An example, not a benchmark: 3 new mailboxes, starting at 5 a day each, adding 3 a day, target 30 a day per mailbox, and 150 campaign emails a day needed.
| Day | Per mailbox | All 3 mailboxes | Cumulative (all) |
|---|---|---|---|
| 1 | 5 | 15 | 15 |
| 2 | 8 | 24 | 39 |
| 3 | 11 | 33 | 72 |
| 4 | 14 | 42 | 114 |
| 5 | 17 | 51 | 165 |
| 6 | 20 | 60 | 225 |
| 7 | 23 | 69 | 294 |
| 8 | 26 | 78 | 372 |
| 9 | 29 | 87 | 459 |
| 10 | 30 | 90 | 549 |
Day 10 is the first day at target, so your earliest campaign start is day 11. Each mailbox sends 5 + 8 + 11 + 14 + 17 + 20 + 23 + 26 + 29 + 30 = 183 warm-up emails, or 549 across the three. Capacity at target is 3 × 30 = 90 a day. For 150 a day you need 150 ÷ 30 = 5 mailboxes, so you are 2 short: add two now so they warm on the same schedule, or accept 90 a day.
Switch the planner to a 20% daily ramp from the same start and the climb takes 11 days (5, 6, 7, 9, 10, 12, 15, 18, 21, 26, 30), because percentage growth is slow when the base is small.
What good looks like, and what to do next
A warm-up is working when opens and replies from the warm-up network stay high, spam-folder placement is near zero, and bounce rate on your real campaign stays low after launch. If spam placement climbs while volume is still under 20 a day, the problem is not the ramp; it is authentication or list quality. Check your SPF record, DKIM and DMARC, run your copy through a spam words checker, and clean the list so your bounce rate stays under control. Google requires SPF, DKIM and DMARC for anyone sending 5,000 or more messages a day to Gmail, and at least SPF or DKIM for everyone else.
When the schedule is done, keep a small warm-up stream running alongside campaigns so the mailbox always has replied-to mail in its history. If you need more volume, add mailboxes on the same ramp rather than raising the number on each one.
Do you need a paid email warm up tool?
The planner gives you the schedule. Something still has to send them.
Manually. Send real one-to-one emails to colleagues, friends and your own other accounts on the schedule, and have them reply and rescue anything that lands in spam. Free, and fine for one or two mailboxes. It does not scale to ten.
With a warm-up service. Tools such as Instantly, Smartlead, Lemwarm, Warmup Inbox, Mailreach and Warmy connect your mailbox to a network of other users' mailboxes that open, reply and move messages out of spam automatically. Most sending platforms bundle warm-up with the campaign tool, so check what you already pay for before buying another. Either way, the ramp should look like the schedule above and you should be able to explain every day's volume.
Whichever you choose, the foundations covered in why cold emails go to spam matter more than the ramp: authentication, a clean list, an unsubscribe line, and copy that reads like a person wrote it. Score a draft with the free email deliverability scorer before day one.
Warm mailboxes are only useful with a list worth sending to. The Find Customers range gives you verified decision-maker contacts matched to your target market, so the volume you just planned goes to people who can buy.
FAQ
How long does it take to warm up an email account?
It depends on your start, step and target, which is why this planner exists. At 5 a day, adding 3 a day, a mailbox reaches 30 a day in 10 sending days; a gentler ramp for a brand-new domain takes longer. Google's guidance is to start low and increase slowly, with no fixed timetable, so let the arithmetic set your date.
How many emails a day can I send from a new mailbox?
Provider limits are high: 2,000 a day per Google Workspace user, 500 for personal Gmail, 10,000 recipients a day in Exchange Online. Reputation is the real ceiling. Cold email tools commonly keep new mailboxes to 30 to 50 a day and add mailboxes for more volume. Start at 5 and let the schedule climb.
Do I need an email warm up tool or can I do it manually?
You can warm one or two mailboxes manually by sending real emails to people who will reply and rescue anything from spam. Beyond that, a warm-up network saves time and keeps engagement consistent. Many sending platforms include warm-up at no extra cost, so check what you already pay for before adding a separate subscription.
How do I warm up a new email domain?
Set up SPF, DKIM and DMARC before the first email. Create your mailboxes, then run each one through a ramp like the one this planner produces, starting at a handful of messages to engaged recipients and increasing gradually. Keep spam rate below 0.10% in Google Postmaster Tools and keep a small warm-up stream running after you launch campaigns.
Should I keep warming up after my campaign starts?
Yes. Reputation is built on recent history, so most senders keep a reduced warm-up stream running alongside campaigns. It gives the mailbox a steady flow of opened and replied-to mail, which offsets the lower engagement that cold outreach gets. Pause it only when you retire the mailbox.
What is a free email warm up tool?
This planner is free and gives you the schedule and mailbox count. For the sending side, several platforms include warm-up with a paid campaign plan, and some standalone tools have free tiers for one mailbox. What matters is that the ramp is gradual and consistent, which you can check against the schedule here.
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