Looking for the best email warm-up service in 2025? Here are the top 10 free email warm-up tools. They are Mails.ai, Instantly.ai, Lemwarm, Warmup Inbox, MailReach, Woodpecker, TrulyInbox, Warmbox, QuickMail, and Folderly. Each email warm-up tool helps you get your emails into inboxes. They also help your emails not go to spam. You need email warm-up tools if you want your emails to reach inboxes. These warmup solutions boost your sender reputation. They also act like real people and protect your email deliverability. See how email warm-up services change inbox placement in the chart below. Mails.ai is special because it has unlimited features and strong protection.
Key Takeaways
Email warm-up tools help your emails go to inboxes. They stop your emails from going to spam. These tools make your sender reputation better.
Choose tools that have automation and analytics. Look for inbox rotation and support for many accounts. These features save time and help you get better results.
Mails.ai is special because it allows unlimited accounts. It uses AI-powered features and inbox rotation. You also get free email verification in its free plan.
Start warming up by sending only a few emails each day. Slowly send more emails over time. This helps email providers trust you.
Keep your email list clean and check deliverability often. Avoid common mistakes to keep your emails in inboxes.
Top 10 Free Email Warm-Up Tools
If you want your emails in the inbox, not spam, you need a good email warm-up tool. Here are the top 10 free email warm-up tools for 2025. Each tool helps you gain trust from email providers and makes your sender reputation better. Let’s see what makes each tool special.
Selection Criteria for the Best Free Email Warm-Up Tools in 2025:
You should pick tools that are simple to use and work with your email provider. The best email warm-up tools have automation, analytics, and let you use many accounts. They help you watch your sender reputation and lower bounce rates.
Criteria/Feature | Reason for Importance |
|---|---|
User Reviews | Shows if real users like the tool and if it works |
Pricing | Lets you check if free or paid plans fit your money |
Features | Has automation, analytics, and helps deliverability |
Platform Compatibility | Makes sure the tool works with your email provider |
Support Options | Helps you fix problems fast |
Deliverability Improvement | Gets your emails into inboxes, not spam folders |
Automation Capabilities | Saves time by sending emails automatically |
Monitoring Tools | Watches your sender reputation and email health |
Email Validation | Helps stop bounce rates and spam complaints |
Mails.ai Email Warmup
Mails.ai gives you a strong free email warm-up tool. You can connect as many Gmail and Google Workspace accounts as you want. The warm-up uses AI to send, open, and reply to emails, so your activity looks real. You get unlimited warm-up, inbox rotation, and free email checking. The dual-layer warm-up helps both your mailbox and your campaigns. Real-time analytics show your open rates, replies, and inbox placement. You can manage all your warm-up campaigns in one spot. Most free email warm-up tools limit your accounts or features, but Mails.ai lets you grow without paying more.
Feature / Aspect | Mails.ai Free Plan Features | Typical Other Free Email Warmup Tools Features |
|---|---|---|
Email Accounts | Unlimited email accounts supported | Usually limited number of accounts |
Unlimited warmup included | Usually limited warmup capacity | |
AI Automation | AI-powered email writing and dual-layer warmup | Generally lack AI-powered automation |
Analytics | Advanced analytics and sender reputation dashboard | Basic or no analytics |
Inbox Rotation | Supported | Often not available |
Campaign Tools | Integrated campaign management | Usually absent or minimal |
Email Verification | Free email verification included | Generally absent or limited |
You get all these features for free, which is rare for email warm-up tools.
Instantly.ai
Instantly.ai is a popular email warm-up tool for people new to this. You can set it up quickly and start warming up your emails right away. The tool sends, opens, and replies to emails by itself. You get a simple dashboard to see your progress. Instantly.ai helps your emails go to inboxes, not spam. You can connect as many accounts as you want and send as many warm-up emails as you need. The free plan is easy to use, but some special features like click tracking and custom warm-up settings are only in paid plans. If you want an easy email warm-up tool, Instantly.ai is a good pick.
Simple setup and easy-to-use interface.
Sends, opens, and replies to emails automatically.
Unlimited accounts and sending.
Some features, like advanced settings, need a paid plan.
Lemwarm
Lemwarm is the email warm-up tool from Lemlist. The free plan lets you warm up one inbox and starts with about 10 emails each day. The number goes up slowly, so it takes time to see big changes. Lemwarm helps your emails get into inboxes and not spam. Over 45 days, users see inbox placement go from 60% to 85% and spam drop from 40% to under 10%. The reply rate doubles, and bounce rates get lower. If you want to warm up one account and don’t mind waiting, Lemwarm’s free plan is a good choice.
Warmup Inbox
Warmup Inbox makes email warm-up easy. You can set it up in a few minutes and start making your sender reputation better right away. The dashboard is simple, even for beginners. Warmup Inbox sends, opens, and replies to emails to help you stay out of spam folders. You get visual reputation scores and helpful analytics. Users like the fast setup and friendly support. The free plan is good for small teams or people working alone. Some special features, like domain health checks, are only in paid plans, but the free features work well for basic needs.
Pros (Supporting Effectiveness of Free Features) | Cons (Limitations Mainly in Paid Tiers) |
|---|---|
Easy and fast setup, inbox ready in minutes | Limited control over warming volume without upgrading |
Beginner-friendly dashboard with visual reputation scores | Some manual handling needed to filter warm-up emails |
Reliable warm-up engine that improves deliverability and sender reputation | Advanced diagnostics like domain health checks are missing |
Responsive and helpful customer support praised in reviews | Some users find license management and scaling challenging |
Scalable for teams managing many inboxes | ESP targeting requires higher-tier plans |
Good reporting and analytics for tracking warm-up performance | Team/account-level management options limited as volume scales |
Affordable compared to premium tools | Occasional preference for chat support over live calls |
MailReach
MailReach is a fully automated email warm-up tool. You can warm up to 90 emails each day, which is great for bigger campaigns. The tool gives you a deliverability score, so you always know how your emails are doing. MailReach connects with big email providers and acts like a real person by moving emails out of spam. You also get a free spam tester to check if your emails might get flagged. The interface is simple, and you can see your progress easily. MailReach is not expensive and is easy to use, so many people like it.
Strength/Feature | Description |
|---|---|
Fully Automated Warmup | Automates the whole process, so you save time. |
High Volume Capacity | Warms up to 90 emails per day for large campaigns. |
Deliverability Scoring | Shows how well your emails are performing. |
ISP Integrations | Works with major providers for better inbox placement. |
Spam Interaction Simulation | Moves emails out of spam and marks them as safe. |
Free Email Spam Tester | Lets you check if your emails will go to spam. |
Affordability | Costs less than many competitors. |
User-Friendly Interface | Easy to set up and manage. |
Transparent Monitoring | Clear reports on your warm-up progress. |
Woodpecker
Woodpecker has a free email warm-up tool that works with many email providers. You just turn on the warm-up add-on, pick your accounts, and let it work. The tool sends, opens, and replies to emails, and even moves messages from spam to the inbox. Woodpecker supports API and webhook integrations, so you can connect it to your workflow. After setup, you don’t need to do anything else. The tool keeps your sender reputation strong and helps your emails reach the inbox. Google stopped supporting automated warm-up for Gmail, but Woodpecker still works with other providers.
Turn on the warm-up add-on in your account.
Pick the email accounts or domains to warm up.
The tool works in the background, sending, opening, and replying to emails.
It moves emails from spam to inbox.
Works with many providers except Gmail (because of Google changes).
Easy integration with API and webhooks.
TrulyInbox
TrulyInbox is special for its automation and flexibility. You can connect as many inboxes as you want, even on the free plan. You control how many emails get sent each day, the reply rate, and how fast you increase the volume. The interface is simple and easy to use. TrulyInbox lets you set up your warm-up plan the way you want. This kind of control is rare for free email warm-up tools. If you want to manage many inboxes and fine-tune your warm-up, TrulyInbox is a smart choice.
Feature/Aspect | TrulyInbox | Warmy.io |
|---|---|---|
Number of inboxes allowed | Unlimited inboxes even on starting plan | Only one inbox per plan |
Email sending volume | 100 emails/day on $22/month plan, split across inboxes | 100 emails/day but only from one inbox |
Cost per inbox | About $5 per inbox | Nearly $50 per inbox |
Warm-up strategy control | Full customization (emails sent, reply rate, ramp-up volume) | Limited customization |
User interface | User-friendly and intuitive | More complex setup |
Automation level | High automation with flexible control | Less flexible automation |
Warmbox
Warmbox is an AI-powered email warm-up tool. It sends, opens, and replies to emails in a way that looks real to email providers. You can watch your sender reputation and see how many emails go to the inbox. Warmbox works with Gmail, Outlook, and other big platforms. The tool uses AI to make your warm-up look real, which helps you avoid spam filters. You can set up Warmbox fast and see results in a few days. The free plan is good for small teams or solo users who want better deliverability.
QuickMail
QuickMail used to have its own email warm-up tool, but now it works with MailFlow.io for free warm-up services. You can still warm up your emails for free, but MailFlow.io runs the service, not QuickMail. There are no clear limits on how much you can use it, but QuickMail does not run the warm-up itself anymore. The integration is smooth, and you can start warming up your emails right away. This is a good choice if you already use QuickMail for outreach.
No built-in warm-up, uses MailFlow.io integration.
Free warm-up service for everyone.
No clear limits on use, but features may change.
Folderly
Folderly is a smart email warm-up tool that helps you stay out of the spam folder. The tool sends, opens, and replies to emails in a way that looks human. Folderly tracks your inbox and spam rates, so you always know where your emails go. The dashboard shows your domain reputation and gives you tips to fix problems. Folderly works with Gmail, Outlook, and SMTP. You don’t need any tech skills to start. The tool gives you AI-based tips to help your deliverability and keep your emails out of spam.
Sends, opens, and replies to emails automatically.
Tracks inbox vs. spam placement and domain reputation.
Gives AI tips to fix deliverability issues.
Works with big email platforms.
Tip:
When picking an email warm-up tool, look for automation, analytics, and support for many accounts. Make sure the tool fits your business and helps you reach more inboxes.
What Is Email Warmup?
Email Warmup Explained
Sometimes your emails go to spam, even if they are good. This happens because email providers do not trust new or quiet accounts. They want to see you send real messages, not spam. Email warmup helps fix this problem. You start by sending just a few emails each day. Over time, you send more emails as you build trust. People should open, reply, and mark your emails as important. This helps your sender reputation get better. Experts say it takes about 8 to 12 weeks to warm up. During this time, you show good habits to email providers. The goal is to get your emails into inboxes, not spam.
Here’s what you do during email warmup:
Start with a small number of emails.
Slowly send more as your reputation grows.
Get replies and engagement from real people.
Keep your sending steady and natural.
Why Email Warmup Matters
If you want your emails in the inbox, you need a good sender reputation. Email warmup helps you get there. Many businesses use warm-up tools because lots of emails are spam. Email providers have strict rules to protect users. If you send too many emails too fast, your emails may not reach inboxes.
Here are some reasons to use email warmup:
Reason for Using Email Warmup Tools | Explanation |
|---|---|
Prevent Emails from Landing in Spam | Sending more emails slowly helps you avoid spam filters. This builds trust with ISPs and gets your emails into inboxes. |
Repair Damaged Sender Reputation | If your domain has a bad reputation, warmup helps you fix it. It rebuilds trust with email providers. |
Increase Inbox Placement Rate | Warmup helps your emails land in the main inbox. This means more people see and read your emails. |
Facilitate Email Service Provider Migration | Warmup helps when you switch email providers. It keeps your sender reputation safe. |
Build Strong Sender Reputation | Sending emails slowly looks natural. This makes your reputation stronger over time. |
Improve Engagement and Open Rates | Warmup helps more people open and reply to your emails. |
Prepare for Scaling Email Campaigns | Warmup lets you send more emails safely. This keeps your reputation strong and avoids spam filters. |
A good warmup process protects your reputation and helps your emails get seen. You get better open rates and more replies. If you plan to send lots of emails or switch providers, warmup keeps your reputation strong. A good sender reputation helps your emails reach the inbox.
Features to Look for in Free Email Warm-Up Tools
When you choose an email warmup tool, you want it to be easy and helpful. Some features are more important than others. Let’s see what you should look for before picking a free warm-up tool.
Automation
You do not want to send every email by yourself. Automation lets the tool do this work for you. The tool sends, opens, and replies to emails on its own. This saves you time and helps your sender reputation. You can set up the tool to send more emails slowly. This makes your email activity look normal. Many tools let you plan follow-ups and use inbox rotation. This keeps your outreach safe and steady. Automation helps you avoid mistakes and keeps your campaigns working well.
Automation lets you send more emails over time.
It copies how people send emails to avoid spam filters.
You get more replies and better inbox results.
Automated tools can work with your CRM for easy use.
You spend less time on boring tasks and more time growing.
Deliverability Tracking
You want your emails to go to inboxes, not spam. Deliverability tracking shows if your warm-up is working. Good tools track things like delivery rate, bounce rate, open rate, and inbox placement. You can see if emails get blocked or marked as spam. This helps you fix problems fast and keep your reputation strong. The best tools have dashboards with simple charts and reports.
Metric | Description | Benchmark |
|---|---|---|
Delivery Rate | Emails accepted by recipient servers | 89%-95% |
Bounce Rate | Emails that fail to reach recipients | Below 0.3% |
Spam Complaint Rate | Recipients marking emails as spam | Under 0.1% |
Open Rate | Recipients opening emails | Above 20% |
Inbox Placement Rate | Emails landing in inboxes | Over 80% |
Inbox Rotation
Inbox rotation is a smart feature in warmup tools. It spreads your warm-up emails across many inboxes. This keeps each inbox safe and lowers spam complaints. You do not send too many emails from one account. This helps your emails get delivered. Inbox rotation also helps you reach more people and keeps your reputation strong. If you want to send more emails, you need inbox rotation.
Inbox rotation keeps your reputation safe.
It makes your sending look normal.
You avoid getting blocked by ISPs.
Your emails keep landing in inboxes.
AI Engagement
AI engagement makes your warmup smarter. AI can write warm-up emails, open messages, click links, and reply like a real person. This helps email providers trust your emails. AI-powered tools change sending volume and spot spam risks. You get better inbox placement and more opens. AI engagement lets you send more emails without losing the personal touch.
Tip: Pick warmup tools that use AI to write warm-up emails and manage follow-ups. This helps your emails get delivered and keeps your campaigns strong.
Experts say the best free warm-up tools have sender reputation monitoring, automated warm-up, personalized emails, blacklist checks, and easy dashboards. You want a tool that helps you grow, keeps your emails safe, and saves you time.
Comparing Top Email Warmup Tools
Picking an email warm-up tool can be hard. You want your emails in the inbox, not spam. Let’s see how the top tools compare. This will help you choose the best one for your needs.
Features Comparison Table
This table shows what each email warm-up tool does. It helps you find tools with strong deliverability and easy setup.
Tool | Unlimited Accounts | AI Engagement | Inbox Rotation | Free Email Verification | Advanced Analytics | Campaign Warmup |
|---|---|---|---|---|---|---|
Mails.ai | Yes | Yes | Yes | Yes | Yes | Yes |
Instantly.ai | Yes | Yes | No | No | Basic | No |
Lemwarm | No | Yes | No | No | Yes | No |
Warmup Inbox | No | Yes | No | No | Basic | No |
MailReach | No | Yes | No | No | Yes | No |
Woodpecker | No | No | No | No | Basic | No |
TrulyInbox | Yes | No | No | No | Basic | No |
Warmbox | No | Yes | No | No | Yes | No |
QuickMail | No | No | No | No | Basic | No |
Folderly | No | Yes | No | No | Yes | No |
Tip: Mails.ai is great if you want unlimited accounts and strong deliverability features.
Free Plan Limitations
Most free email warm-up plans have limits. Some only let you use one account. Others limit how many emails you send each day. This table shows the main limits for each tool.
Tool Name | Notes | |
|---|---|---|
Mails.ai | Unlimited Gmail/Workspace accounts, unlimited warmup | Free plan fits most users |
Instantly.ai | Unlimited accounts, limited advanced features | Paid plan needed for extras |
Lemwarm | One inbox, slow warmup volume | Good for solo users |
Warmup Inbox | Limited accounts, basic analytics | Paid plan for more features |
MailReach | Limited daily warmup, no advanced analytics | Paid plan for higher volume |
Woodpecker | No Gmail support, limited to other providers | Add-on required |
TrulyInbox | Forever-free but very limited | |
Warmbox | Limited daily warmup, basic analytics | Paid plan for more volume |
QuickMail | Free via MailFlow.io, basic features | No built-in warmup |
Folderly | Limited features, paid plan for full access | AI tips included |
Pros and Cons
Each email warm-up tool has good and bad sides. Here’s what people like and dislike about these tools.
Pros | Cons |
|---|---|
Helps emails reach inboxes and improves deliverability | Free plans have limited analytics |
Daily email limits can slow results | |
AI engagement makes emails look real | Some tools do not let you customize |
Works with many email providers | Warm-up is not the main feature for some tools |
Monitors results and helps recover from spam | Beginners may need time to learn |
Note: Pick a tool that matches your goals and how many emails you send. If you want to grow fast and keep your emails out of spam, choose a tool with unlimited features and strong analytics.
Mails.ai Email Warmup Features
Dual-Layer Warmup
You want your emails in the inbox, not spam. Mails.ai uses two layers to help you. The first layer slowly sends more emails each day. This helps you avoid spam filters. The second layer does things like opening and replying to emails. It also marks emails as important. These actions look real to email providers. Your sender reputation gets better because your activity seems normal. Mails.ai checks your email authentication, like SPF, DKIM, and DMARC. This makes email providers trust you more. You can warm up new ips and domains with less risk. This dual-layer system gives your campaigns a strong start.
Inbox Rotation
Inbox rotation spreads your warmup across many accounts. You do not want to send too many emails from one inbox. That can hurt your sender reputation. With inbox rotation, you share the warm-up work. This keeps your reputation safe and helps your deliverability. You can send more emails without getting flagged. Your warmup stays steady, and your emails keep landing in inboxes.
Tip: Inbox rotation is a smart way to protect your sender reputation and grow your outreach safely.
Email Verification
Bad email addresses can hurt your deliverability. Mails.ai checks every email before you send it. This step removes risky or fake addresses. You get fewer bounces and better results from your warm-up. Clean lists help your sender reputation. You can trust that your warm-up emails reach real people. This makes your email warmup work better.
Trust Score Monitoring
You need to know if your email warmup is working. Mails.ai gives you a Trust Score for each account. This score tracks your reputation, inbox placement, open rates, and spam complaints. You can see if your deliverability is strong or needs work. If your score drops, you can change your warm-up right away. Trust Score monitoring helps you keep a healthy sender reputation and get the best results from every email.
Feature | How It Helps You |
|---|---|
Builds trust and boosts deliverability | |
Inbox Rotation | Protects sender reputation |
Email Verification | Reduces bounces and spam risks |
Trust Score Monitoring | Tracks reputation and inbox placement |
You get all these features in one place. Mails.ai makes email warmup easy and strong.
How to Choose the Best Email Warmup Tool
Assessing Your Needs
Before you pick any tool, think about what you want from your email outreach. Do you plan to send a lot of emails every day, or just a few? Maybe you need detailed reports, or you want to see real-time results. Some tools, like Warmbox.ai, use machine learning to track deliverability and blacklist status. Others, such as Warmforge, offer affordable plans with full monitoring, which is great if your business is growing. If you reach out to people in different countries, you might want a tool like Warmy.io that supports many languages. You should also look for features like AI-driven personalization, real-time deliverability tracking, and strong security. These help you get better results and keep your sender reputation safe.
Here’s a quick checklist to help you match features to your needs:
Do you need automation for sending and replying to emails?
Is real-time deliverability tracking important for you?
Will you manage multiple accounts or just one?
Do you want detailed reports and analytics?
Is pricing flexibility a must for your budget?
Do you need email validation to reduce bounces?
Provider Compatibility
You want your email warm-up tool to work with your email provider. Some tools connect easily with Gmail, Outlook, or Google Workspace. Others, like Warmforge, work well with Office 365 and even check your DNS and MX records. Warmy.io supports many providers, including Sendgrid and Amazon SES, so you can warm up any domain or IP. If your tool matches your provider, you get better inbox placement and smoother automation. Some tools even test your placement with different email service providers, so you know where your emails land. When you choose the best email warm-up tool, always check if it supports your current setup.
Ease of Use
You want a tool that feels simple and friendly. If you spend too much time setting up, you might get frustrated. Look for a dashboard that shows your email health, inbox placement, and reputation in a clear way. Tools like Mailreach and SmartReach.io make it easy to manage multiple accounts and see results fast. User reviews on sites like G2 and Capterra can help you spot tools that are easy to use and have good support. If you plan to scale your outreach, pick a tool that grows with you and keeps things simple.
Tip: The right tool should fit your skills, your email provider, and your campaign size. When you choose the best email warm-up tool, you set yourself up for better inbox results and less stress.
Tips to Maximize Email Deliverability
Best Practices
You want your emails to go to the inbox, not spam. To help this happen, follow these easy steps:
Always set up SPF, DKIM, and DMARC. These records show your emails are real. They help inbox providers trust you.
Start your warmup slow. Send only a few emails each day. Raise the number by 15-20% each week. This helps mailbox providers trust you more.
Keep your email list clean. Remove hard bounces and people who unsubscribe. If someone never opens your emails, take them off your list.
Use a steady schedule for sending emails. Do not send a lot one day and none the next. Sending at the same pace helps your reputation.
Write emails people want to open and read. Try different subject lines and messages. See which ones work best for getting into inboxes.
Work with a trusted email service provider. A good provider helps protect your reputation and makes deliverability better.
Tip: Good deliverability starts with strong basics. Focus on technical setup, keeping your list clean, and sending emails on a steady schedule.
Monitoring Results
You cannot fix what you do not watch. Use analytics dashboards to see how your emails do. Check your inbox placement, open rates, and click rates often. Watch for spam complaints and bounces. If you see problems, change your warmup or email content. Many warmup tools let you see results in real time. This helps you spot issues fast. Set up feedback with big ISPs to get reports on spam complaints. Test your emails often to keep your deliverability high.
Avoiding Common Mistakes
Mistakes can hurt your inbox placement and sender reputation. Here is a table to help you avoid the most common problems:
Mistake | Why It Hurts Deliverability | How to Fix It |
|---|---|---|
Not setting up SPF, DKIM, DMARC | Emails look fake and get blocked | Set up all three before starting the warmup process |
Sending too many emails quickly | Looks like spam to inbox providers | Start slow and increase volume gradually |
Using dirty or random lists | Causes bounces and spam complaints | Only send to verified, engaged contacts |
Inconsistent sending | Confuses mailbox providers | Stick to a regular schedule |
Ignoring sender reputation | Lowers inbox placement and trust | Monitor deliverability and fix issues fast |
Writing spammy emails | Triggers spam filters | Use natural, personalized language |
No replies or engagement | Signals low value to providers | Encourage replies and real conversations |
Note: Avoiding these mistakes keeps your sender reputation strong. This helps your emails reach the inbox every time.
Choosing the best email warm-up service can change how your email lands in the inbox. You want your email to reach people, not get stuck in spam. Mails.ai gives you unlimited email accounts, unlimited warmup, inbox rotation, and free email verification. You get high email deliverability every time. If you want the best email warm-up service, you need a tool that works for every email. Try the best email warm-up service now. Your email outreach will grow fast. Ready to see results? Start with the best email warm-up service and boost your email success. Start your free trial today!
FAQ
What is an email warm-up tool?
An email warm-up tool helps you build trust with email providers. It sends, opens, and replies to emails for you. This makes your account look real and keeps your emails out of spam.
How long should I warm up my email account?
You should warm up a new account for at least 2 to 4 weeks. If your domain is older, you might need less time. Watch your deliverability stats to know when you’re ready.
Can I use Mails.ai with any email provider?
You can use Mails.ai with Gmail and Google Workspace for free. If you want to connect Outlook, Zoho, or other providers, you’ll need a paid plan. Check your provider before you start.
Why do my emails still go to spam after warm-up?
Warm-up helps, but other things matter too. Bad content, broken links, or a dirty list can hurt you. Always check your email setup, write clear messages, and keep your list clean.
Do I need to keep warming up my email forever?
No, you don’t. Once your sender reputation is strong, you can slow down or stop the warm-up. If you see deliverability drop, start warming up again for a few days.
Tip: Keep an eye on your inbox placement. If you notice problems, restart your warm-up to fix them fast.
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