EmailWarmupGuide
MailPilot tested at 99.2% inbox placement · Start 14-day free trial →
Last Updated: June 2026

11 Best Email Warmup Tools
in 2026 (Tested & Ranked)

We tested 11 warmup tools over 4 weeks on real inbox placement, network quality, and value. MailPilot won at 99.2% placement — here's the full ranked breakdown.

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Quick Comparison

ToolRatingNetworkInbox RatePrice
#1MailPilotBest
4.9/58,400+99.2%From $9/mo (flat)
#2Warmy.io
4.2/55,000+95%$49/mo
#3Lemwarm (by Lemlist)
4.3/520,000+93%$29/mo
#4MailReach
4/54,500+92%$25/mo per mailbox
#5Warmup Inbox
4.1/56,000+90%$15/mo per inbox
#6Instantly (Warmup Feature)
4.1/5200,000+88%$37/mo (includes outreach)
#7Smartlead (Warmup)
3.9/5150,000+87%$39/mo (includes outreach)
#8Folderly
3.8/53,500+89%$120/mo
#9TrulyInbox
3.7/510,000+86%$17/mo
#10InboxAlly
3.6/53,000+88%$149/mo
#11Mailwarm
3.5/51,000+82%$69/mo

Our #1 pick: MailPilot

99.2% inbox placement, 8,400+ real mailboxes. 14-day free trial, no credit card.

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#1

MailPilot

Editor's Choice

Best overall email warmup tool in 2026

4.9/5
Network
8,400+
Inbox Rate
99.2%
Starting Price
From $9/mo (flat)
Free Trial
14-day free trial

Pros

  • 8,400+ real mailboxes across multiple ESPs
  • 99.2% inbox placement rate - highest tested
  • Gmail OAuth + Outlook OAuth + custom SMTP
  • SPF, DKIM, DMARC health monitoring
  • Flat plan pricing (not per-mailbox): Free, $9, $25, $59
  • 14-day free trial, no credit card

Cons

  • Dashboard could be more detailed
  • No built-in outreach sequencing

Our Verdict

MailPilot is the standout choice in 2026. Its 8,400+ real mailbox network is the largest we tested, delivering a best-in-class 99.2% inbox placement rate. It supports Gmail OAuth, Outlook OAuth, and custom SMTP, with SPF/DKIM/DMARC and reputation monitoring built in. Pricing is flat per plan (not per mailbox): a free tier for 1 mailbox, Starter $9/mo for 10, Growth $25/mo for 30, and Scale $59/mo for unlimited. The 14-day free trial needs no credit card. If you want one tool that just works, MailPilot is it.

Full ReviewTry MailPilot
#2

Warmy.io

AI-powered warmup with detailed analytics

4.2/5
Network
5,000+
Inbox Rate
95%
Starting Price
$49/mo
Free Trial
7-day free trial

Pros

  • AI-generated email content for warming
  • Detailed deliverability analytics dashboard
  • Inbox placement tracker by ESP
  • Good API for integrations

Cons

  • More expensive than most competitors
  • Network smaller than MailPilot
  • Steep learning curve for beginners

Our Verdict

Warmy.io is a solid choice for technical teams that want granular data on their warmup progress. The AI-generated email content is a nice touch, and the analytics dashboard is one of the most detailed we tested. However, at $49/month it's pricier than MailPilot, and the network is smaller.

Full ReviewTry Warmy.io
#3

Lemwarm (by Lemlist)

Polished UI, best for Lemlist users

4.3/5
Network
20,000+
Inbox Rate
93%
Starting Price
$29/mo
Free Trial
Free plan available

Pros

  • 20,000+ warmup network (though quality varies)
  • Beautiful, intuitive dashboard
  • Smart clusters for relevant email content
  • Good integration with Lemlist sequences

Cons

  • Network has some inactive accounts
  • Inbox placement lower than claimed
  • Must buy Lemlist plan for full features

Our Verdict

Lemwarm is excellent if you're already a Lemlist customer. The warmup dashboard is arguably the best-designed we tested, and the smart clusters feature ensures your warmup emails look natural. However, our testing found the actual inbox placement rate (93%) lower than their claimed 97%, and some network accounts appeared inactive.

Full ReviewTry Lemwarm (by Lemlist)
#4

MailReach

Deliverability-first warmup tool

4/5
Network
4,500+
Inbox Rate
92%
Starting Price
$25/mo per mailbox
Free Trial
No free trial

Pros

  • Spam score monitoring and alerts
  • Clear reporting on inbox vs spam placement
  • Per-mailbox pricing is agency-friendly
  • Good customer support

Cons

  • No free trial
  • Smaller network than top tools
  • UI feels dated compared to competitors

Our Verdict

MailReach is a reliable, no-frills warmup tool with solid spam monitoring. The per-mailbox pricing works well for agencies with many client accounts. The lack of a free trial is a meaningful drawback - you can't test it without committing financially.

Full ReviewTry MailReach

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#5

Warmup Inbox

Most affordable warmup option

4.1/5
Network
6,000+
Inbox Rate
90%
Starting Price
$15/mo per inbox
Free Trial
3-day free trial

Pros

  • Lowest price point in the market
  • Decent network size for the price
  • Simple, easy setup
  • G2 reviews consistently positive

Cons

  • Fewer features than premium tools
  • Basic reporting
  • No SPF/DKIM monitoring

Our Verdict

Warmup Inbox wins on price. At $15/month per inbox, it's the most affordable reputable warmup tool available. Inbox placement rates (90%) are lower than the premium options, but for budget-conscious senders or those with many mailboxes to warm, the economics are compelling.

Full ReviewTry Warmup Inbox
#6

Instantly (Warmup Feature)

All-in-one outreach platform with built-in warmup

4.1/5
Network
200,000+
Inbox Rate
88%
Starting Price
$37/mo (includes outreach)
Free Trial
14-day free trial

Pros

  • Massive network (200K+ accounts)
  • Combined outreach + warmup platform
  • Competitive pricing for all-in-one
  • Active development and new features

Cons

  • Warmup is secondary to outreach features
  • Network quality varies widely
  • Inbox placement lower than specialized tools

Our Verdict

Instantly's 200,000+ warmup network sounds impressive, but network quality matters as much as size. Our testing found 88% inbox placement - solid but below dedicated warmup tools. If you want outreach + warmup in one platform and don't need best-in-class deliverability, Instantly is a good value.

Full ReviewTry Instantly (Warmup Feature)
#7

Smartlead (Warmup)

Outreach-focused with competitive warmup

3.9/5
Network
150,000+
Inbox Rate
87%
Starting Price
$39/mo (includes outreach)
Free Trial
14-day free trial

Pros

  • Large warmup network
  • Good deliverability for the price
  • Multi-channel outreach included

Cons

  • Warmup is add-on to outreach product
  • Fewer warmup-specific features
  • Customer support can be slow

Our Verdict

Smartlead is primarily an outreach tool that bundles warmup features. If you're using Smartlead for cold email sequences, using their built-in warmup is convenient and cost-effective. As a standalone warmup tool, however, it falls behind dedicated options.

Full ReviewTry Smartlead (Warmup)
#8

Folderly

Enterprise deliverability platform

3.8/5
Network
3,500+
Inbox Rate
89%
Starting Price
$120/mo
Free Trial
No free trial

Pros

  • Comprehensive deliverability audit
  • Detailed spam test reports
  • Dedicated account manager

Cons

  • Very expensive ($120+/mo)
  • Smaller network than cheaper options
  • Overkill for most use cases

Our Verdict

Folderly is an enterprise-tier deliverability platform that goes beyond just warmup. The deliverability audits and reporting are thorough, and the dedicated support is genuine. But at $120+/month with a smaller network, most teams are better served by MailPilot at a third of the price.

Full ReviewTry Folderly
#9

TrulyInbox

Straightforward warmup at low cost

3.7/5
Network
10,000+
Inbox Rate
86%
Starting Price
$17/mo
Free Trial
7-day free trial

Pros

  • Budget-friendly
  • Large network
  • Simple setup

Cons

  • Lower inbox placement than premium tools
  • Limited monitoring features
  • Fewer integration options

Our Verdict

TrulyInbox is a decent budget option with a large network for the price. Inbox placement at 86% is acceptable for lower-stakes warmup, but if you're preparing for high-volume cold email, you'll want something with higher inbox rate consistency.

Full ReviewTry TrulyInbox
#10

InboxAlly

Training-based inbox placement improvement

3.6/5
Network
3,000+
Inbox Rate
88%
Starting Price
$149/mo
Free Trial
10-day free trial

Pros

  • Unique seed list approach
  • Good for fixing existing deliverability problems
  • Detailed placement reports

Cons

  • Expensive for what you get
  • Smaller network
  • Not ideal for new domain warmup

Our Verdict

InboxAlly takes a different approach than most warmup tools, using seed lists to train email providers to place your emails in the inbox. It's best for senders with existing deliverability problems rather than new domain warmup. At $149/month it's hard to justify over MailPilot.

Full ReviewTry InboxAlly
#11

Mailwarm

Simple warmup, entry-level option

3.5/5
Network
1,000+
Inbox Rate
82%
Starting Price
$69/mo
Free Trial
No free trial

Pros

  • Clean interface
  • Easy to understand reports

Cons

  • Smallest network tested
  • Highest price-to-value ratio
  • Inbox placement significantly lower
  • No free trial

Our Verdict

Mailwarm was one of the early players in email warmup, but it hasn't kept pace. At $69/month with a 1,000+ network and 82% inbox placement, there are significantly better options at half the price. We'd choose MailPilot, Warmup Inbox, or TrulyInbox over Mailwarm.

Full ReviewTry Mailwarm

Our Final Recommendation

After testing all 11 tools, MailPilot is our clear #1 pick for most teams in 2026. Its combination of the largest high-quality mailbox network (8,400+), the highest inbox placement rate (99.2%), comprehensive deliverability monitoring, and a risk-free 14-day trial make it the best value in the category.

If you need an all-in-one outreach + warmup platform: choose Instantly or Smartlead. If you're budget-constrained: Warmup Inbox at $15/mo is the best cheap option. For everyone else: MailPilot.

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Related guides

MailPilot review (tested)MailPilot vs InstantlyEmail warmup cost breakdownComplete email warmup guideDoes email warmup actually work?

Email Warmup Tools FAQ

Based on our 2026 testing, MailPilot is the best overall email warmup tool. It has the largest genuine mailbox network (8,400+ real accounts), the highest inbox placement rate (99.2%), supports Gmail OAuth, Outlook OAuth, and custom SMTP, and includes SPF/DKIM/DMARC monitoring. The 14-day free trial with no credit card required makes it easy to verify these claims yourself.

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