13 Top Email Warmup Tools for Better Inbox Placement

Launching cold email campaigns from a new inbox without warming it up first makes it much harder to reach the inbox consistently. Email warmup tools automate the gradual sending and receiving of messages to build sender reputation before your campaigns begin.

Some platforms focus exclusively on email warmup, while others bundle it into larger sales engagement or deliverability platforms. The right choice depends on your email provider, sending volume, budget, and whether you need a dedicated warmup tool or a broader platform with warmup built in.

Key takeaways

• Dedicated warmup tools make sense if you already have an outreach platform and only need to improve sender reputation.
• All-in-one sales platforms bundle warmup with sequencing, prospecting, and campaign management.
• Compare network quality, deliverability features, supported email providers, and pricing, not just monthly cost.
• Email warmup works best alongside proper SPF, DKIM, and DMARC authentication, verified contact lists, and healthy sending habits.
• Choose a tool that fits your existing workflow instead of paying for features you’ll never use.

How we selected these email warmup tools

We selected these tools based on the features and capabilities that matter most for email warmup and deliverability. Instead of focusing only on price, we compared each platform’s warmup approach, supported email providers, deliverability features, reporting, ease of setup, pricing, and overall value.

We also looked at whether each product is a dedicated warmup service, part of a broader sales engagement platform, or a deliverability platform with warmup built in. That distinction often has a bigger impact on the right choice than the feature list alone.

Pricing, free plans, and supported integrations were verified using vendor documentation where available. Because providers update these details regularly, we recommend confirming current pricing before making a final decision.

How to choose the right email warmup tool

Take a look at these categories and keep them in mind while you’re choosing the right fit for your team.

Email provider compatibility

Confirm the tool supports your sending infrastructure, whether that’s Google Workspace, Microsoft 365, Outlook, SMTP, or a transactional email service. Some tools only work with Gmail, while others support a much wider range of providers.

Warmup network quality

Most tools build sender reputation by exchanging emails within a network of inboxes. The quality of that network matters. Networks made up of real business inboxes typically provide more realistic engagement than those relying heavily on free consumer accounts, disposable addresses, or artificially generated activity.

Deliverability features

Many platforms go beyond automated warmup. Inbox placement testing, blacklist monitoring, authentication checks (SPF, DKIM, and DMARC), and sender reputation monitoring can help identify deliverability problems before they affect your campaigns.

Reporting and automation

Look for clear dashboards, automated warmup schedules, and the ability to adjust sending volume over time. Good reporting makes it easier to understand when your sender reputation is improving and when it’s safe to scale your campaigns.

Dedicated warmup tool or all-in-one platform

If you already use a sales engagement platform, its built-in warmup feature may be all you need. If deliverability is your main focus, a dedicated warmup tool usually provides more specialized monitoring and controls.

The tools we’ve selected fall into three broad categories:

• Dedicated email warmup tools for building and maintaining sender reputation.
• Sales engagement platforms with built-in warmup that combine warmup with prospecting, sequencing, and campaign management.
• Deliverability platforms that pair warmup with inbox placement testing, authentication monitoring, and reputation analysis.

Dedicated email warmup tools

Dedicated email warmup tools focus entirely on building and maintaining sender reputation. If you already have an outreach platform or simply want the best possible inbox placement without paying for sales features you’ll never use, this category is the best place to start. 

1. Warmup Inbox

Best for: Teams that want a dedicated email warmup platform with deliverability monitoring built in.

Warmup Inbox is a dedicated email warmup platform designed to improve sender reputation before you launch cold email campaigns. Unlike platforms that bundle warmup into a larger sales suite, it focuses entirely on deliverability. 

Its network consists of approximately 30,000 real business inboxes, with no free Gmail or Outlook accounts, creating engagement patterns that more closely reflect real B2B email activity.

Once connected, your inbox automatically sends and receives warmup emails, replies to messages, marks important emails, and rescues messages from the spam folder. You can choose between progressive, flat, or randomized warmup schedules depending on how quickly you plan to increase sending volume.

Beyond warmup, Warmup Inbox includes inbox placement testing, blacklist monitoring, DMARC monitoring, spam score checks, and built-in email verification. It also offers a unique Warm up this content feature that sends your actual campaign copy through the warmup network before launch, helping establish positive engagement signals for the content you’ll eventually send. 

Support for 23 languages makes it a strong option for international campaigns.

Key features

• Dedicated B2B warmup network with approximately 30,000 inboxes
• Progressive, flat, and randomized warmup schedules
• Inbox placement testing
• Blacklist, spam score, and DMARC monitoring
• Built-in email verification
• Warm up this content campaign pre-warming
• Supports Google Workspace, Microsoft 365, SMTP, and IMAP
• Warmup content available in 23 languages

Pricing

Basic plans start at approximately $15-19 per inbox per month, depending on billing cycle. Pro and Max plans support higher daily sending volumes and additional features. Verify current pricing before purchasing.

Drawbacks

Microsoft 365 warmup results can be less consistent than Google Workspace because business Outlook inboxes are less common within the warmup network. There’s also no free pan, but you can take advantage of a week-long free trial.

[Try 7 days free]

2. Mailwarm

Best for: Teams that want straightforward email warmup with flexible scheduling.

Mailwarm focuses on the basics like connecting your inbox, gradually increasing sending activity, replying to messages, and recovering emails that land in spam. One feature that stands out is its customizable warmup schedule, letting you control when warmup starts and stops each day instead of running continuously.

The platform is easy to set up and works well if your only goal is warming a handful of inboxes. The main drawback is pricing. Mailwarm is one of the more expensive dedicated warmup tools, while offering fewer deliverability features than many competitors.

Key features

• Automated email warmup
• Custom daily warmup schedules
• Spam folder recovery
• Automated replies and engagement
• Personalized warmup emails

Pricing

Plans start at approximately $55-69/month for one inbox. Larger plans support additional inboxes at a higher monthly cost. Verify current pricing before purchasing.

Drawbacks

Mailwarm focuses almost entirely on warmup. It doesn’t include inbox placement testing, authentication monitoring, or broader deliverability diagnostics found in some competing platforms.

3. Mailreach

Best for: Teams that want email warmup with built-in deliverability monitoring.

Mailreach combines automated email warmup with tools that help monitor sender reputation over time. In addition to exchanging emails through its network, it includes blacklist monitoring, spam score testing, and deliverability reports that highlight potential issues before campaigns begin.

Compared to simpler warmup tools, Mailreach provides more visibility into your inbox health. However, if you’re looking for broader authentication monitoring or inbox placement testing, you’ll find deeper feature sets elsewhere.

Key features

• Automated email warmup
• Spam score testing
• Blacklist monitoring
• Deliverability reports
• Supports multiple email providers

Pricing

Plans start at approximately $25 per inbox per month. Verify current pricing before purchasing.

Drawbacks

There is no free plan, and its deliverability toolkit isn’t as comprehensive as platforms built specifically around deliverability monitoring.

4. Warmbox

Best for: Teams that want AI-generated warmup emails with deliverability reporting.

Warmbox combines automated email warmup with AI-generated email content to create more varied conversations across its inbox network. It also includes blacklist monitoring, sender reputation tracking, and reporting that helps identify potential deliverability issues as your reputation develops.

The platform supports most major email providers and keeps setup relatively simple. While the AI-generated conversations add variety, Warmbox provides less transparency about its warmup network than some competitors.

Key features

• AI-generated warmup conversations
• Automated email warmup
• Blacklist monitoring
• Sender reputation tracking
• Deliverability reporting
• Supports major email providers

Pricing

Plans start at approximately $15/month, depending on daily sending volume. Verify current pricing before purchasing.

Drawbacks

There’s no free plan, and teams that want greater visibility into how the warmup network operates may prefer platforms that provide more detail about their infrastructure.

Sales engagement platforms with built-in warmup

These platforms combine email warmup with prospecting, sequencing, and campaign management. If you’re already using one of them for cold outreach, the built-in warmup feature is often enough. 

Dedicated warmup tools generally offer more specialized deliverability monitoring, but an all-in-one platform can simplify your workflow and reduce the number of tools you need.

5. Lemwarm

Best for: Teams already using Lemlist for cold outreach.

Lemwarm is the built-in warmup service for Lemlist and one of the longest-running tools in this category. It gradually builds sender reputation by exchanging emails through a network of real inboxes, automatically replying to messages, recovering emails from spam, and marking important emails.

Its biggest advantage is convenience. If you already rely on Lemlist for prospecting and outreach, there’s no need to manage a separate warmup platform. If warmup is all you need, however, dedicated tools typically offer more monitoring features at a lower price.

Key features

• Automated email warmup
• Real inbox network
• Spam folder recovery
• Adjustable daily warmup volume
• Built into the Lemlist platform

Pricing

Lemwarm is available through Lemlist plans, with pricing starting at approximately $24-40/month, depending on the plan and billing cycle. Verify current pricing before purchasing.

Drawbacks

It’s best value for existing Lemlist users. Teams looking only for email warmup may find dedicated alternatives more affordable and feature-rich.

6. Reply.io

Best for: Sales teams that want warmup alongside a complete sales engagement platform.

Reply combines multichannel sales engagement with automated email warmup, making it a good fit for teams that want to manage outreach and sender reputation from the same platform. 

Warmup starts automatically for connected mailboxes and includes reputation tracking, peer-to-peer inbox interactions, and deliverability monitoring alongside email sequences and follow-up automation.

Key features

• Automated email warmup
• Business inbox network
• Google Workspace and Microsoft 365 support
• Sales engagement platform integration
• LinkedIn automation and Chrome extension

Pricing

Reply.io includes email warmup with every connected mailbox, making it one of the few platforms that bundles warmup into its core plans instead of selling it as a separate add-on. Pricing is based on factors such as active contacts, billing cycle, and optional features, which can make the plans harder to compare.

Drawbacks

This platform is a full sales engagement platform rather than a dedicated email warmup tool. Teams that only need warmup may find the platform more feature-rich and expensive than necessary.

7. Woodpecker

Best for: Existing Woodpecker users who want warmup included with their outreach platform.

Woodpecker includes email warmup as part of its cold email platform at no additional cost. After connecting your inbox, it automatically exchanges emails, recovers messages from spam, and helps rebuild sender reputation. You can warm up an individual inbox or an entire domain, and the platform also includes a recovery mode for damaged sender reputations.

Like other bundled solutions, the warmup feature makes the most sense if you’re already using Woodpecker for outreach. Dedicated warmup platforms generally provide more extensive deliverability monitoring.

Key features

• Warmup included with Woodpecker
• Domain or inbox-level warmup
• Recovery mode
• Spam folder recovery
• Cold outreach platform integration

Pricing

Woodpecker plans start at approximately $40/month (annual billing), with warmup included. Verify current pricing before purchasing.

Drawbacks

Most advanced automation features only make sense if you’re running cold email campaigns, not just maintaining sender reputation.

Deliverability platforms with warmup

These platforms treat email warmup as one part of a wider deliverability toolkit. Alongside building sender reputation, they help monitor inbox placement, authentication, spam rates, and domain health. 

They’re often a better fit for teams troubleshooting deliverability issues rather than simply warming up a new inbox.

8. Folderly

Best for: Teams that want email warmup alongside advanced deliverability monitoring.

Folderly features AI-assisted email warmup with a broader set of deliverability tools. In addition to building sender reputation, it analyzes email performance, identifies authentication and inbox placement issues, and provides recommendations for improving deliverability. It can also support outreach workflows, making it more than a standalone warmup platform.

Folderly is one of the more expensive options in this comparison, so it’s easier to justify if you need its wider deliverability insights rather than warmup alone.

Key features

• AI-assisted email warmup
• Inbox placement and deliverability analysis
• Authentication monitoring
• Sender reputation tracking
• Campaign performance insights

Pricing

Plans start at approximately $96/month per mailbox. Verify current pricing before purchasing.

Drawbacks

Folderly is one of the more expensive email deliverability platforms, making it difficult to justify for individuals and small teams.

9. Warm Up Your Email (Mailshake)

Best for: Mailshake users and teams that want warmup with simple deliverability insights.

Warm Up Your Email, acquired by Mailshake in 2021, concentrates on improving sender reputation through ongoing inbox activity while also providing a spam score that tracks how often your emails reach the inbox versus spam. It supports Google Workspace, Microsoft 365, Amazon SES, Mailgun, and several other providers.

If you already use Mailshake, it fits naturally into your workflow. Teams looking for advanced authentication monitoring or inbox placement testing, however, may need a more comprehensive deliverability platform.

Key features

• Automated email warmup
• Spam score reporting
• Supports Google Workspace, Outlook, Amazon SES, and Mailgun
• Multi-provider support
• Mailshake integration

Pricing

Plans start at $29/month for one email account with up to 50 positive engagements per day. Pro and Agency plans increase the number of supported email accounts and daily warmup capacity while including spam pattern analytics and 24/7 support.

Drawbacks

Its deliverability toolkit is relatively lightweight compared to more comprehensive platforms.

10. Mailflow.io

Best for: Teams that want email authentication checks alongside warmup.

Mailflow combines automated email warmup with sender authentication monitoring. It verifies SPF and DKIM records, monitors blacklist status, and tracks sender reputation throughout the warmup process, helping identify configuration problems before they affect deliverability.

It’s a good choice if you want more than basic warmup without moving to a larger enterprise deliverability platform.

Key features

• Automated email warmup
• SPF and DKIM verification
• Blacklist monitoring
• Sender reputation tracking
• Deliverability monitoring

Pricing

Mailflow offers a free plan with up to 5 warmup emails per day. Paid plans start at $49/month, with a higher tier at $99/month that increases warmup limits and adds additional monitoring features.

Drawbacks

Compared to larger deliverability platforms, Mailflow provides less public information about its warmup network and reporting capabilities.

11. TrulyInbox

Best for: Teams that want inbox placement analysis alongside automated warmup.

TrulyInbox combines email warmup with deliverability diagnostics, helping you understand where your emails land and what might be affecting inbox placement. It includes customizable warmup schedules, reporting, and recommendations aimed at improving overall sender reputation.

The platform is geared toward users who want ongoing visibility into deliverability rather than simply warming up a new inbox.

Key features

• Automated email warmup
• Inbox placement analysis
• Deliverability recommendations
• Custom warmup schedules
• Reporting and analytics

Pricing

TrulyInbox offers a free plan for one email account with 10 warmup emails per day. Paid plans start at $22/month (billed annually) and increase the daily warmup volume while supporting unlimited email accounts. A 7 day free trial is available on paid plans.

Drawbacks

Advanced features such as custom warmup strategies and detailed analytics are only available on higher tier plans.

12. Autowarmer (QuickMail)

Best for: Teams looking for a generous free warmup option.

Autowarmer is QuickMail’s free email warmup service and works independently of the company’s paid outreach platform. It supports Google Workspace, Microsoft 365, Outlook, and SMTP inboxes, allowing you to warm up as many as 50 inboxes without paying. Paid plans increase daily sending limits and unlock additional capabilities.

For teams getting started with email warmup, it’s one of the strongest free options in this comparison.

Key features

• Free warmup for up to 50 inboxes
• Google Workspace, Outlook, and SMTP support
• Automated email warmup
• Business-focused warmup content
• Automatic email archiving

Pricing

QuickMail offers three paid plans starting at $49/month. All plans include a free MailFlow AutoWarmer, unlimited users, and a 14 day free trial, with higher tiers increasing email sending limits, contact capacity, and automation features such as API access and webhooks.

Drawbacks

Several advanced automation features, including API access and webhooks, are only available on the higher tier plans.

13. InboxWarm (OutreachBin)

Best for: Budget-conscious teams that want a simple standalone warmup service.

InboxWarm is OutreachBin’s dedicated email warmup platform. It gradually builds sender reputation through automated inbox interactions and supports Google Workspace, Microsoft 365, Amazon SES, SendGrid, SMTP, and several other providers. The service is designed to keep warmup running continuously, helping maintain sender reputation after your initial ramp-up period.

Its low starting price is appealing to smaller teams, although it offers fewer deliverability insights than more specialized platforms.

Key features

• Automated email warmup
• Supports Google Workspace, Microsoft 365, SMTP, Amazon SES, and SendGrid
• Continuous reputation maintenance
• Human-like email interactions
• Broad provider compatibility

Pricing

Plans start at $19.97 per email account per month with annual billing, or $39.99/month on a three month plan. Every plan includes email warmup, cold email outreach, unlimited campaigns, advanced analytics, A/B testing, unlimited team members, and more than 1,000 Zapier integrations.

Drawbacks

InboxWarm is designed to improve sender reputation but does not replace broader email deliverability testing.

Email warmup tools compared

Choosing an email warmup tool often comes down to how you work rather than which platform has the longest feature list. Some tools focus exclusively on warming inboxes, and others bundle warmup with sales engagement or broader deliverability monitoring.

Tool	Best for	Free plan	Starts at	Warmup only	Deliverability tools	Sales platform
Warmup Inbox	Best overall	⏳ Trial	~$15–19/inbox	✅	✅	❌
Mailwarm	Simple warmup	❌	~$55–69/mo	✅	❌	❌
Mailreach	Warmup + monitoring	❌	~$25/inbox	✅	✅	❌
Warmbox	AI-generated warmup	❌	~$15/mo	✅	✅	❌
InboxWarm	Budget option	❌	~$19.97/inbox	✅	❌	❌
Autowarmer	Free warmup	✅	Free / $49+	✅	❌	❌
Lemwarm	Lemlist users	❌	~$24–40/mo	❌	❌	✅
Reply.io	Sales teams	⏳ Trial	Varies	❌	✅	✅
Woodpecker	Existing Woodpecker users	❌	~$40/mo	❌	❌	✅
Folderly	Advanced diagnostics	❌	~$96/mailbox	❌	✅	⚠️ Limited
Warm Up Your Email	Mailshake users	❌	~$29/inbox	✅	⚠️ Basic	❌
Mailflow	Authentication monitoring	✅	$49/mo	✅	✅	❌
TrulyInbox	Inbox placement insights	✅	$22/mo	✅	✅	❌

Which email warmup tool should you choose?

Here are some good starting points based on common use cases.

If you want…	Recommended tool
The best all-around email warmup platform	Warmup Inbox
A budget-friendly dedicated warmup tool	InboxWarm
A free way to start warming inboxes	Autowarmer
Warmup built into a sales engagement platform	Reply.io
The simplest dedicated warmup tool	Mailwarm
AI-generated warmup conversations	Warmbox
Warmup with deliverability monitoring	Mailreach
Advanced deliverability diagnostics	Folderly
Authentication monitoring alongside warmup	Mailflow
Inbox placement insights alongside warmup	TrulyInbox
Built-in warmup for Lemlist users	Lemwarm
Built-in warmup for Woodpecker users	Woodpecker

Next steps

Email warmup is one piece of a healthy sending strategy. It works best alongside properly configured SPF, DKIM, and DMARC records, verified contact lists, and a gradual increase in sending volume.

If your primary goal is improving sender reputation, a dedicated warmup platform usually gives you the best balance of automation, visibility, and control. If you’re already running campaigns through a sales engagement platform, its built-in warmup feature may be all you need.

Warmup Inbox combines automated warmup with inbox placement testing, blacklist monitoring, DMARC monitoring, and email verification, giving you the tools to build and maintain sender reputation from one dashboard.

[Try 7 days free]

Frequently asked questions

What is an email warmup tool?

An email warmup tool gradually builds sender reputation by automatically sending and receiving emails through a network of inboxes. It also performs actions like replying to messages, marking emails as important, and recovering emails from the spam folder to create positive engagement signals.

Why is email warmup important?

New inboxes have little or no sending history, making email providers more cautious about the messages they receive. Warming up an inbox before launching campaigns helps build trust gradually and can improve inbox placement. Warmup works best alongside proper SPF, DKIM, and DMARC authentication, verified contact lists, and healthy sending practices.

How long should I warm up an email account?

Most inboxes benefit from at least two to four weeks of gradual warmup before sending larger campaigns. Many teams continue running warmup in the background afterward to help maintain sender reputation over time.

Do email warmup tools actually work?

They can, but they’re only one part of email deliverability. A warmup tool won’t fix poor authentication, low-quality contact lists, or spammy email content. The best results come from combining warmup with good sending practices and proper domain authentication.

Should I choose a dedicated warmup tool or an all-in-one platform?

It depends on your workflow. Dedicated warmup tools focus entirely on improving sender reputation and often include additional deliverability features. If you already use a sales engagement platform like Reply or Woodpecker, its built-in warmup feature may be enough and can simplify your workflow.