12 Best Email Warmup Tools for 2026: Real Pricing, Deliverability Scores & What Actually Works

Your cold emails are going to spam. You spent hours crafting the perfect sequence, building a targeted list, personalizing every line — and 40% of your messages never reach the inbox.

The culprit isn't your copy. It's your sender reputation.

Email warmup tools fix this by simulating real email activity — sending, receiving, opening, replying, and marking emails as important — to build your domain's reputation with email providers like Google and Microsoft. Without warmup, new outbound domains get flagged as spam within days.

But here's the problem: most "best email warmup tools" lists are written by the tools themselves. They rank their own product #1, hide the pricing, and skip the hard questions — like how long warmup actually takes, what happens when you stop, and whether the tool actually moves the needle on deliverability.

We tested 12 tools. Here's what we found.

Why Email Warmup Matters for SDR Teams

Before we get to the tools — why should you care?

The math is brutal: If your domain has a poor sender reputation, 30-50% of your cold emails land in spam. On a 1,000-email sequence, that's 300-500 prospects who never see your message. At a 2% reply rate on delivered emails, you're leaving 6-10 replies on the table every campaign.

For SDR teams running outbound at scale, email warmup isn't optional. It's table stakes.

What warmup actually does:

• Sends emails from your inbox to a network of real inboxes
• Those inboxes open, read, reply, and mark emails as "not spam"
• Gmail and Outlook learn that emails from your domain are legitimate
• Your sender score improves, and emails start landing in Primary instead of Spam/Promotions

How long it takes: Most tools need 2-4 weeks to fully warm a new domain. Some claim faster, but rushing warmup can backfire — sudden volume spikes look suspicious to email providers.

The 12 Best Email Warmup Tools for 2026

1. Instantly (Best for Teams Already Using Instantly for Outreach)

Pricing: Included with Instantly outreach plans starting at $30/month (Growth plan)

Instantly bundles email warmup into its outreach platform, which makes it the path of least resistance for teams already using Instantly for cold email. The warmup connects your inboxes to a network of 200K+ real accounts that interact with your emails automatically.

What works:

• Unlimited warmup accounts on all plans — no per-inbox charges
• Built into your outreach workflow, so there's no separate tool to manage
• Dashboard shows inbox placement rate (primary vs. spam vs. promotions)
• Gradually ramps sending volume automatically

What doesn't:

• Warmup quality depends on Instantly's network — and some users report that their network inboxes have gotten flagged themselves, creating a "warming up with cold inboxes" problem
• Can't use the warmup standalone — you need to buy the full outreach platform
• Limited control over warmup behavior (reply rate, open rate targets)

Best for: Teams already on Instantly who want warmup baked into their outreach stack without paying extra.

2. Lemwarm (Best Standalone Warmup with Smart Customization)

Pricing: $29/month per email account (part of Lemlist ecosystem)

Lemwarm is Lemlist's dedicated warmup tool, and it's one of the more sophisticated options. It customizes warmup behavior based on your industry, email provider, and sending goals — so a SaaS SDR warming up a Google Workspace account gets different treatment than an agency warming up Outlook.

What works:

• Industry-specific warmup templates that match your typical email patterns
• Detailed deliverability dashboard with DNS health checks (SPF, DKIM, DMARC)
• Smart ramping that adjusts based on your inbox placement scores
• Integrates seamlessly with Lemlist outreach (if you use it)

What doesn't:

• $29/month per email adds up fast — 10 inboxes = $290/month just for warmup
• Locked into Lemlist ecosystem for best results
• Some users report slower warmup compared to larger-network tools

Best for: Teams that want customizable, intelligent warmup and are willing to pay premium per-inbox pricing.

3. Warmy.io (Best for Enterprise-Grade Deliverability)

Pricing: Starter at $49/month per mailbox, Business at $129/month, Premium at $429/month

Warmy.io positions itself as the premium option, and the pricing reflects it. What you get for the premium: AI-powered warmup that adapts in real-time, plus advanced features like seed list testing (sending test emails to see where they land across major providers).

What works:

• Adeline AI engine optimizes warmup patterns dynamically
• Seed list testing shows exact inbox placement across Gmail, Outlook, Yahoo
• Email template checker scans your actual copy for spam triggers
• Detailed analytics with historical reputation tracking

What doesn't:

• Expensive — $49/month per mailbox is 3x what some competitors charge
• Overkill for small teams with a few outbound inboxes
• Setup can be complex for non-technical users

Best for: Enterprise sales teams with large mailbox fleets that need granular deliverability analytics and can justify the cost.

4. Mailreach (Best for Deliverability Testing + Warmup Combo)

Pricing: $25/month per email account, with volume discounts

Mailreach combines warmup with ongoing deliverability testing — which is what most teams actually need. You don't just want to warm up once; you want to continuously monitor whether your emails are still hitting the inbox after you start sending campaigns.

What works:

• Continuous inbox placement monitoring (not just during warmup)
• Blacklist monitoring with instant alerts
• Large warmup network with high-reputation inboxes
• Simple, clean dashboard that non-technical SDR managers can understand

What doesn't:

• No outreach features — it's purely warmup and deliverability
• Per-account pricing without unlimited tiers
• Limited customization of warmup behavior

Best for: Teams that want reliable warmup plus ongoing deliverability monitoring without the complexity.

5. Warmbox (Best Budget Option)

Pricing: Solo at $15/month (1 inbox), Pro at $49/month (5 inboxes), Growth at $99/month (25 inboxes)

Warmbox is the cheapest standalone warmup tool that actually works. At $15/month for a single inbox, it's accessible for solopreneurs and early-stage startups that can't justify $29+ per mailbox.

What works:

• Lowest entry price in the market ($15/month)
• Clean interface with warmup progress tracking
• Multiple warmup "recipes" (aggressive, moderate, conservative)
• Decent network size for the price

What doesn't:

• Smaller warmup network than premium tools
• Limited reporting compared to Warmy.io or Mailreach
• No deliverability testing or seed list features

Best for: Budget-conscious teams that need basic warmup without the premium price tag.

6. TrulyInbox (Best for Unlimited Mailboxes)

Pricing: $29/month for unlimited mailboxes (flat rate)

TrulyInbox's killer feature is unlimited mailboxes at a flat rate. If you're running 20+ outbound inboxes (which serious SDR teams often do), the math is dramatically better than per-inbox pricing.

What works:

• Unlimited mailboxes on all plans — game-changer for teams with 10+ inboxes
• 30,000+ inbox warmup network
• Human-like sending patterns (variable timing, natural reply content)
• Shared team dashboard

What doesn't:

• Newer tool with smaller track record than Lemwarm or Instantly
• Limited integrations with outreach platforms
• Warmup volume limits shared across all inboxes

Best for: Agencies and SDR teams managing 10+ outbound mailboxes who want predictable flat-rate pricing.

7. Saleshandy (Best All-in-One with Built-in Warmup)

Pricing: Outreach Starter at $25/month includes warmup for connected accounts

Like Instantly, Saleshandy bundles warmup into its outreach platform. The difference: Saleshandy has been around longer and has a more mature deliverability engine. Their TrulyInbox partnership means you get their warmup network baked in.

What works:

• Warmup included with outreach plans (no separate cost)
• A/B testing for email sequences alongside warmup
• Unified inbox for managing replies across warmed-up accounts
• Good Gmail and Outlook compatibility

What doesn't:

• Warmup is secondary to the outreach platform — can't use standalone
• Warmup customization is limited compared to dedicated tools
• Higher plans get expensive ($66-$166/month)

Best for: Teams that want a single outreach + warmup platform and don't need standalone warmup flexibility.

8. Snov.io (Best for Lead Gen + Warmup in One Stack)

Pricing: Starter at $39/month, includes warmup + email finder + sequences

Snov.io is unique because it combines email finding, verification, warmup, and outreach in one platform. If you're building lists AND sending cold email, it eliminates the need for 3-4 separate tools.

What works:

• Full stack: find emails → verify → warm up → send sequences
• Built-in email verification catches bad addresses before they hurt your reputation
• Decent warmup network with automated sending patterns
• Chrome extension for LinkedIn prospecting

What doesn't:

• Jack of all trades, master of none — warmup isn't as sophisticated as dedicated tools
• Smaller warmup network than Instantly or Warmy.io
• Can feel overwhelming with so many features

Best for: Small teams that want an all-in-one prospecting and outreach stack with warmup included.

9. Mailivery (Best for Agency Teams)

Pricing: Starts at $37/month, agency plans available

Mailivery uses AI to simulate realistic email conversations rather than just sending generic warmup messages. The result is more natural-looking email activity that email providers are less likely to flag.

What works:

• AI-generated realistic email conversations (not just "Hi, how are you?" loops)
• Agency dashboard for managing multiple client inboxes
• Detailed sender score tracking over time
• Good balance of price and features

What doesn't:

• Higher starting price than budget alternatives
• AI conversations can sometimes look oddly formatted
• Smaller company with less community support

Best for: Agencies managing warmup across multiple client accounts who want realistic interaction patterns.

10. Folderly (Best for Deliverability Audits)

Pricing: Custom pricing (typically $120-200/month), enterprise-focused

Folderly goes beyond simple warmup — it's a full email deliverability platform that diagnoses WHY your emails go to spam and fixes it. Think of it as an email deliverability consultant in software form.

What works:

• Deep DNS/SPF/DKIM/DMARC auditing with fix recommendations
• Content analysis that identifies specific spam triggers in your templates
• Ongoing deliverability monitoring with alerts
• White-glove onboarding for enterprise teams

What doesn't:

• No transparent pricing — you have to talk to sales
• Overkill for teams that just need basic warmup
• Enterprise sales process means slow setup

Best for: Enterprise teams with persistent deliverability problems that need diagnostic capabilities, not just warmup.

11. Warmup Inbox (Best Simple, No-Frills Option)

Pricing: $15/month per inbox

Warmup Inbox does exactly what the name says — warms up your inbox. No outreach features, no lead finding, no AI conversations. Just warmup that works.

What works:

• Simple setup (connect inbox, turn on warmup, done)
• 30,000+ inbox network for realistic interactions
• Inbox health score that updates daily
• Affordable at $15/month per inbox

What doesn't:

• Very basic — no advanced analytics or deliverability testing
• Per-inbox pricing adds up for larger teams
• Limited reporting compared to Mailreach or Warmy.io

Best for: Solo SDRs or small teams that want dead-simple warmup without complexity.

12. SmartReach.io (Best Multi-Channel Platform with Warmup)

Pricing: Starts at $24/month per seat, warmup included

SmartReach combines email, LinkedIn, WhatsApp, and calling into one multichannel outreach platform — with email warmup included. If your SDR team needs more than just email, it's worth considering.

What works:

• Multichannel sequences (email + LinkedIn + calls) with built-in warmup
• Shared inbox for team collaboration
• Good CRM integrations (HubSpot, Salesforce, Pipedrive)
• Decent warmup network included in all plans

What doesn't:

• Warmup is a feature, not the focus — less sophisticated than dedicated tools
• Interface can feel cluttered with so many channel options
• Limited warmup analytics

Best for: SDR teams running multichannel outbound who want warmup bundled into their sequence tool.

Email Warmup Tools Comparison Table

Tool	Price/Month	Unlimited Inboxes	Standalone	Deliverability Testing	Best For
Instantly	From $30	✅	❌	Basic	Teams on Instantly
Lemwarm	$29/inbox	❌	✅	✅	Customizable warmup
Warmy.io	From $49/inbox	❌	✅	✅ Advanced	Enterprise teams
Mailreach	$25/inbox	❌	✅	✅	Monitoring + warmup
Warmbox	From $15	❌	✅	❌	Budget teams
TrulyInbox	$29 flat	✅	✅	❌	Bulk inbox warmup
Saleshandy	From $25	✅	❌	Basic	Outreach + warmup
Snov.io	From $39	❌	❌	❌	All-in-one stack
Mailivery	From $37	❌	✅	❌	Agencies
Folderly	Custom ($120+)	❌	✅	✅ Deep	Deliverability audits
Warmup Inbox	$15/inbox	❌	✅	❌	Simple warmup
SmartReach	From $24/seat	❌	❌	Basic	Multichannel teams

How to Choose the Right Email Warmup Tool

The right tool depends on three factors:

1. How Many Inboxes Are You Warming?

• 1-3 inboxes: Warmbox ($15/inbox) or Warmup Inbox ($15/inbox) — keep costs low
• 5-10 inboxes: Mailreach ($25/inbox) or Lemwarm ($29/inbox) — get better analytics
• 10+ inboxes: TrulyInbox ($29 flat) or Instantly (included) — unlimited pricing saves hundreds

2. Do You Need Standalone Warmup or All-in-One?

• Already have an outreach tool: Get standalone warmup (Mailreach, Lemwarm, Warmy.io)
• Building your outreach stack: Get all-in-one (Instantly, Saleshandy, SmartReach)
• Need everything: Snov.io (find + verify + warm + send)

3. How Serious Are Your Deliverability Problems?

• New domain, just need warmup: Any tool works — Warmbox or TrulyInbox
• Existing domain with spam issues: Mailreach or Warmy.io (diagnostics + warmup)
• Enterprise with persistent issues: Folderly or Warmy.io Premium (deep auditing)

Email Warmup Best Practices (What the Tools Won't Tell You)

Tools alone don't fix deliverability. Here's what actually matters:

1. Set up DNS properly BEFORE warming up. SPF, DKIM, and DMARC records must be configured correctly. No warmup tool can overcome bad DNS. This is free and takes 10 minutes — do it first.

2. Don't rush the ramp. Start with 5-10 warmup emails per day and increase by 3-5 per day. Most tools handle this automatically, but if you override to "aggressive" mode, you'll trigger spam filters.

3. Keep warmup running even after you start sending. Many teams turn off warmup once they begin campaigns. Don't. Keep warmup active at 20-30% of your daily volume to maintain sender reputation.

4. Use separate domains for outbound. Never warm up and send cold email from your primary business domain. Use a separate domain (e.g., getmarketbetter.com instead of marketbetter.com) to protect your main domain's reputation.

5. Monitor inbox placement, not just open rates. Open rates are unreliable (Apple MPP inflates them). Use seed list testing to see where emails actually land.

6. Rotate your inboxes. Don't blast 500 emails from one inbox. Spread volume across 5-10 warmed inboxes to keep per-inbox sending volume low.

The Bigger Problem: Warmup Alone Doesn't Fix Outbound

Here's what most email warmup guides won't tell you: warmup is necessary but not sufficient.

Getting into the inbox is step one. But if your message isn't relevant — if you're emailing the wrong person with a generic pitch — deliverability doesn't matter. You'll get ignored, marked as spam by recipients, and undo all your warmup work.

The teams that actually book meetings from cold email combine:

1. Deliverability infrastructure — warmed domains, proper DNS, inbox rotation
2. Signal-based targeting — knowing WHO to email based on intent signals, not just job title
3. Personalization at scale — messages that reference specific company context, not merge tags
4. Multi-channel sequences — email + LinkedIn + phone, not just email

This is why platforms like MarketBetter combine email deliverability tools with visitor identification and a daily SDR playbook. Instead of warming up inboxes and hoping your list is good, you start with buyers who are already showing intent — visiting your website, engaging with competitors, hiring for relevant roles — and reach them across every channel.

The best email warmup tool is the one you pair with the right targeting. Warmup gets you into the inbox. Intent signals get you a reply.

For more on building an effective outbound engine, check out our guides to best cold email software, email deliverability tools, and SDR metrics and KPIs every team should track.

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Bottom Line

For most SDR teams in 2026:

• Best overall standalone: Mailreach ($25/inbox) — reliable warmup plus continuous deliverability monitoring
• Best for large teams: TrulyInbox ($29 flat) — unlimited inboxes at one price
• Best budget: Warmbox ($15/inbox) — simple warmup that works
• Best bundled: Instantly ($30/month) — warmup included with your outreach platform
• Best enterprise: Warmy.io ($49+/inbox) — AI-powered with deep analytics

Don't overpay for warmup. It's infrastructure, not a competitive advantage. The advantage comes from who you email and what you say — not how you warmed up the inbox.

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Ready to move beyond warmup and start with buyers who are already interested? MarketBetter identifies companies visiting your website, enriches contacts, and builds your daily SDR playbook — so you email warm prospects, not cold lists.

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