Comparison
Best Email Warmup Tools (2026), Compared
The best email warmup tools for most senders are the ones built into Instantly and Smartlead, because they cost nothing extra. Here's how they compare with lemwarm, MailReach, Warmy, Warmup Inbox and TrulyInbox on price per mailbox, free plans and spam tests, and when pre-warmed inboxes beat all of them.
- InstantlyBuilt into sequencerIncluded
- SmartleadBuilt into sequencerIncluded
- TrulyInboxStandalone, flat plan$2.90/box
- Warmup InboxStandalone, per inbox$16/box
- MailReachStandalone, per mailbox$19.50/box
- lemwarmStandalone, per address$29/box
Compared
The best email warmup tools, side by side
Prices from each vendor's pricing page, checked October 2026, monthly billing. Most are about 20% cheaper billed yearly.
| Tool | Type | Price | Free option | Notes |
|---|---|---|---|---|
| Instantly | Built into sequencer | Included in plans from $47/mo | Free trial | Unlimited email accounts and warmup on every plan |
| Smartlead | Built into sequencer | Included in plans from $39/mo | Free trial, no card | Unlimited email accounts; warmup pool tier rises with plan |
| TrulyInbox | Standalone, flat plan | From $29/mo (Starter), unlimited accounts | Free for 1 account, 10 warmup emails a day | Plans capped by warmup emails a day: Starter 200, Growth 1,000 |
| Warmup Inbox | Standalone, per inbox | $19/inbox/mo (Basic); $16 at 10+ inboxes | Free plan: 15 warmup emails a week; 7-day trial | 75 warmup emails a day per inbox on Basic |
| MailReach | Standalone, per mailbox | $19.50/mailbox/mo | Free spam test | At least 20 spam test credits included |
| lemwarm | Standalone, per address | $29/address/mo (Essential) | Included in every lemlist plan | Network of 20k+ domains, per lemwarm |
| Warmy | Standalone, volume-based | From $49/mo | 7-day free trial, no card | Priced by warmup email volume, not per mailbox |
Warmup cost per mailbox per month, warming 10 mailboxes
Monthly billing, October 2026. Instantly and Smartlead include warmup in their sending plans. TrulyInbox is Starter ($29) shared by 10 mailboxes, 200 warmup emails a day in total; Warmup Inbox is Basic at its 10+ inbox rate. Warmy is left out because it doesn't publish per-mailbox prices.
| Instantly | Included |
|---|---|
| Smartlead | Included |
| TrulyInbox | $2.90 |
| Warmup Inbox | $16 |
| MailReach | $19.50 |
| lemwarm | $29 |
Per-mailbox prices only tell half the story. Per-inbox tools (lemwarm, MailReach, Warmup Inbox) cost the same per mailbox at any size bar volume discounts, while flat plans (TrulyInbox, Warmy) get cheaper per mailbox as you add inboxes, up to their daily warmup cap. Check the cap: Warmup Inbox Basic allows 75 warmup emails a day for each inbox, while TrulyInbox Starter shares 200 a day across all of them.
Free
Free email warmup: what you actually get
Free plans are real, but they're built for one or two inboxes. Here's what each free option covers.
- TrulyInbox Free: one email account, 10 warmup emails a day, no card. Enough for a single new inbox.
- Warmup Inbox Freemium: unlimited inboxes but 15 warmup emails a week, which is too little to warm a new cold email inbox on its own. Its paid plans have a 7-day trial.
- Built into your sending tool: Instantly and Smartlead include warmup on every paid plan and offer free trials; lemlist includes lemwarm on every plan. If you pay for one of these anyway, warmup is effectively free.
- Trials: Warmy has a 7-day free trial with no card. MailReach offers a free spam test rather than free warmup.
Free warmup can't fix a broken setup
Your options
Built-in vs standalone email warmup software vs pre-warmed
Three ways to get a mailbox ready for cold email. Costs below are for 10 mailboxes a month on monthly billing.
| Built-in warmup | Standalone warmup tool | Pre-warmed inboxes | |
|---|---|---|---|
| Mailboxes (Jetmail) | $39/mo standard | $39/mo standard | $80/mo after the first month |
| Warmup | Included in your sequencer plan | $29–$290/mo | Keep built-in warmup on, low level |
| Before full cold volume | 2–4 weeks | 2–4 weeks | Day one |
| Extras | Warmup stats in the same tool | Spam tests, reports, bigger networks | DNS already set, sending history built |
| Best for | You send with Instantly, Smartlead or lemlist | Your sending tool has no warmup | Launches, new clients, replacing burned inboxes |
Step 1
Pick your sender
Instantly, Smartlead or lemlist? Use the warmup you already pay for.
Step 2
No warmup built in?
Add one standalone tool, connected by OAuth.
Step 3
Need to send now?
Start with pre-warmed inboxes instead of waiting weeks.
Step 4
Keep it running
Low-level warmup alongside campaigns, one tool per inbox.
Warmup vs pre-warmed
Warmup tool or pre-warmed inboxes?
A warmup tool buys you trust over time. Pre-warmed inboxes buy the time itself. The gap is easiest to see in cold emails sent.
Cold emails sent by one mailbox, cumulative
Example schedule, 5 sending days a week. New mailbox: 2 weeks of warmup only (Instantly's minimum), then 5 → 10 → 20 → 30 a day. Pre-warmed: 30 a day from week 1, Jetmail's planning figure.
| Pre-warmed mailbox, Wk 1 | 150 |
|---|---|
| Pre-warmed mailbox, Wk 2 | 300 |
| Pre-warmed mailbox, Wk 3 | 450 |
| Pre-warmed mailbox, Wk 4 | 600 |
| Pre-warmed mailbox, Wk 5 | 750 |
| Pre-warmed mailbox, Wk 6 | 900 |
| New mailbox + warmup tool, Wk 1 | 0 |
| New mailbox + warmup tool, Wk 2 | 0 |
| New mailbox + warmup tool, Wk 3 | 25 |
| New mailbox + warmup tool, Wk 4 | 75 |
| New mailbox + warmup tool, Wk 5 | 175 |
| New mailbox + warmup tool, Wk 6 | 325 |
In this example a pre-warmed mailbox has sent 900 cold emails by the end of week 6; a new one has sent 325. Multiply that by every mailbox in a launch. The full week-by-week schedule, settings and checks are in the email warmup guide.
Skip the warmup weeks
Pre-warmed Google and Microsoft mailboxes with DNS already set, $6–$8 per mailbox a month after the first month.
Reviews
Each email warmup tool, in brief
What each one is, what it costs and who it suits. Prices are monthly billing unless noted.
Instantly
Warmup comes with every Instantly plan, from $47 a month (Growth), with unlimited email accounts. Instantly recommends at least 2 weeks of warmup and a health score above 90% before campaigns, and 10 warmup emails a day for new accounts. Setup: mailboxes for Instantly.
Smartlead
Warmup is included on every Smartlead plan from $39 a month (Base), with unlimited email accounts; higher plans get a better warmup pool tier. Setup: mailboxes for Smartlead.
lemwarm
lemlist's warmup, included in every lemlist plan or sold alone at $29 per address a month (Essential, $24 billed yearly). Smart, at $49, adds personalized warmup emails and warms your real templates. lemwarm says its network spans 20k+ domains.
MailReach
$19.50 per mailbox a month for warmup plus spam testing, with at least 20 spam test credits included. A good fit if you want placement checks and warmup from one vendor.
Warmy
From $49 a month, priced by the volume of warmup emails rather than per mailbox, with separate plans for B2B (Google Workspace and Microsoft 365 recipients) and B2C (Gmail, Yahoo, Outlook). It doesn't publish mailbox counts per plan, so ask for a quote. 7-day free trial, no card.
Warmup Inbox
Per-inbox pricing: Basic $19 a month ($15 yearly) with 75 warmup emails a day, down to $9.50 per inbox at 50 inboxes. Pro ($59) and Max ($99) raise the daily volume. The free plan covers unlimited inboxes at 15 warmup emails a week.
TrulyInbox
Flat plans with unlimited accounts, capped by warmup emails a day: Free (1 account, 10 a day), Starter $29 (200 a day), Growth $99 (1,000 a day) and Scale $199 (3,000 a day), each about 15–25% less billed yearly. The cheapest way to warm many inboxes if the cap fits.
Choosing the sending tool too? Compare them in the best cold email software.
Your volume
Price pre-warmed inboxes for your volume
Set your monthly cold email volume to see how many mailboxes and domains you need, and what pre-warmed or standard mailboxes cost.
- Mailboxes
- 46
- Domains
- 16
- Jetmail / mo
- $276
30 sends per mailbox per day, 3 mailboxes per domain, 22 sending days. Monthly billing, mailboxes only (domains are extra with every provider). Competitor prices from their public sites, checked Oct 2026.
Monthly cost for 46 pre-warmed mailboxes
- Jetmail$276
- ZapmailPrice not public
- InboxKit$276
- Icemail$276
- Instantly$500
- Zapmail prices shown are first-year prices; its help center says Google Workspace plans rise to $49/$149/$449 after 12 months.
- InboxKit pre-warmed shown at its cheapest tier (2–4 weeks warmed), excluding one-time domain transfer fees.
- Icemail standard price is a limited-time promo ($3.50 list).
- Instantly accounts also need a paid Instantly sending plan (from $47/mo), not included above.
Get this quote by email
We'll send the breakdown plus a domain and DNS plan for 30,000 emails a month.
Checklist
How to choose an email warmup tool
- Already paying for Instantly, Smartlead or lemlist? Use the warmup you have before buying another tool.
- Connect Google and Microsoft mailboxes by OAuth where the tool supports it, rather than app passwords.
- Match the pricing model to your size: per inbox for a handful, flat plans for many, if the daily cap covers them.
- Check the daily warmup volume each plan allows, not just the price.
- Want placement data too? MailReach includes spam tests; otherwise run an inbox placement test.
- Use one warmup tool per inbox, and keep it running at a low level once campaigns start.
- On a deadline, skip the ramp with pre-warmed inboxes.
Sources (checked October 2026): Instantly pricing · Instantly: how warmup works · Smartlead pricing · lemwarm pricing · MailReach pricing · Warmy pricing · Warmup Inbox pricing · TrulyInbox pricing
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Where should we send it?
Or see pricing →Frequently asked questions
What are the best email warmup tools?
If you already send with Instantly or Smartlead, their built-in warmup is the best value because it's included. As standalone tools, TrulyInbox is cheapest for many inboxes, Warmup Inbox and MailReach price per inbox (MailReach adds spam tests), lemwarm comes free with lemlist, and Warmy prices by warmup volume. Prices checked October 2026.
Is there a free email warmup tool?
Yes, with limits. TrulyInbox is free for one account at 10 warmup emails a day, and Warmup Inbox has a free plan with 15 warmup emails a week. Warmup is also included at no extra cost in Instantly, Smartlead and lemlist plans, though those plans are paid.
What does an email warmup tool do?
It connects to your mailbox and exchanges emails with other mailboxes in its network. Those warmup emails are opened, replied to and moved out of spam, and daily volume rises slowly, so a new mailbox builds a sending history before you start cold outreach.
What is automated email warmup?
Warmup that runs without you sending anything by hand. You connect the mailbox, set a daily limit and ramp-up, and the tool sends, opens and replies to warmup emails on a schedule. Every tool on this page automates it; they differ in network, settings and price.
Is Instantly's email warmup free?
It's included at no extra cost in every Instantly plan, from $47 a month on monthly billing as of October 2026, with unlimited email accounts. Instantly recommends at least 2 weeks of warmup, a warmup health score above 90% and 10 warmup emails a day for new accounts.
Do I need a warmup tool if I buy pre-warmed inboxes?
You skip the waiting weeks, but keep warmup running at a low level alongside campaigns, usually with the warmup built into your sending tool, so engagement stays steady.
Can I use two warmup tools on one inbox?
Avoid it. Two networks sending to the same inbox doubles warmup traffic and makes it hard to tell which settings are working. Pick one tool per inbox.