For many years, email felt like the promised land for marketers and salespeople. The ROI is off the charts and with a little bit of preparation, you can reach thousands every day. The only problem is that sending emails unprepared is like going mountain climbing in shorts and a t-shirt. You will get somewhere, but not very far. This is where the email warmup process comes in.
While you can warm up email inboxes manually, it makes more sense to use an email warm up service instead. The market is filled with warm-up tools and today, we’re showing you only the very best.
But first…
What is the email warm up process and why do you need to warm up emails in the first place?
Sending a large number of emails from a brand new email account raises a red flag with email service providers. It immediately shows that the primary reason for creating an address is to send (cold) emails to a large number of recipients. So, instead of sending numerous emails from a new account, you need to warm it up first.
This is how the email warm up process works:
- You start by sending a very small number of emails per day
- Those emails are sent to real inboxes
- Recipients open the emails, reply to them, or mark them as important
- Sending volume increases slowly over days or weeks
This activity signals to email providers that the sender behaves like a real human, not a spammer.
If you have the time and resources, you can do all of this manually and exchange a few emails between addresses to build up a reputation. You’ll have to send emails, reply to them, and finally, gradually increase the volume of emails you send from your target address every day.
If this sounds like too much work, you can use a tool instead.
What are email warm up tools and how do they work?
Email warmup tools have an automated warm up process that works in the background and prepares your address for outreach. Here’s what a typical warm up campaign looks like:
- The tool sends a small number of emails from your inbox each day
- It exchanges emails with other real inboxes in its network
- It automatically opens received emails
- It then automatically replies with short, natural responses
- It removes messages from spam if they land there
- Finally, it slowly increases daily sending volume over time
An email warmup service does the hard work for you, so you can start sending cold emails sooner without hitting the spam folder. It’s a safe way to build up presence and have email service providers consider your address safe to receive emails from.
Once your inbox is properly warmed up, you can start sending campaigns and bypass the spam filters.
What an email warmup tool is NOT
A warmed up inbox is a starting point for using cold email, but on its own, it won’t do much for your sales or marketing efforts.
A warmup tool does not:
- Send your sales emails
- Find leads
- Guarantee inbox placement
It is, however, an essential first step to securing a better sender reputation.
The best email warmup tools for escaping the spam folder in 2026
There are plenty of tools out there offering personalized warm-up emails for multiple email accounts without landing in spam. These are some of the best available options in 2026.
1. Woodpecker: best email warmup tool for sales and outreach teams
Woodpecker is a platform built for teams that need dependable email warmup plus full cold outreach and follow up automation. It is ideal for sales professionals, agencies, and small businesses that want to strengthen inbox reputation before sending high-volume outreach.
Woodpecker combines warmup activity with robust sequence and reply handling to improve deliverability and campaign performance.
Key features
- Automated warmup activity, daily increases in sending that build trust with providers through multiple email accounts simultaneously
- Realistic engagement simulation, opens and replies that mimic human behavior
- Inbox reputation monitoring, visibility into inbox health and trend signals
- Cold email sequencing, build and schedule multi step campaigns
- Reply management, track and organize incoming responses efficiently
- Bounce and spam protection, automatic handling of risky addresses to maintain a solid sender reputation
- Personalization engine, customize outreach for better engagement
- Team workspace support, collaborate with multiple users
- Integration options, connect with CRM and other sales tools
- Detailed reporting, data on deliverability, opens, and engagement
Pricing starts at $24 per month, which gets you two free warmups per month
Try Woodpecker for free today.
2. Mailivery: best for teams that want deliverability focused warmup with real engagement
Mailivery is an email warmup tool that helps inboxes build a positive reputation before sending larger campaigns. It works well for startups, sales teams, and outreach specialists who want realistic opens and replies to boost inbox trust. The tool uses a network of real mailboxes to simulate authentic interactions when sending warm up emails.
Key features
- Automated warmup activity daily growth in sending to establish reputation and land in the inbox, not the spam folder
- Real replies from network partners increases engagement credibility
- Open and click behavior simulated realistic recipient actions
- Spam folder recovery corrects messages that land in spam
- Warmup progress dashboard easy view of deliverability indicators
Pricing starts at $29 per month for 100 warmups
3. Smartlead: best for cold email teams who want warmup plus outreach automation
Smartlead is a platform that combines email warmup with outreach sequence management to help teams build sender reputation and run campaigns from one place. It is geared toward sales professionals, agencies, and growth teams who need both deliverability prep and campaign automation. The tool supports multiple inboxes and automated engagement that mimics real interactions.
Key features
- Built-in warmup flow automatic daily sends to build inbox trust with custom warm up settings
- Network engagement realistic opens and replies from its warmup network
- Cold email sequencing create and manage outreach campaigns
- Analytics dashboard track deliverability and warmup performance
- Multi-inbox support scale warmup and outreach across accounts
Pricing starts at $39 for unlimited email warmups
4. Warmy.io: best for teams looking for automated warmup with smart controls
Warmy.io is an email warmup platform that automatically builds sender reputation through staged engagement before major outreach starts. It works well for sales teams, agencies, and growth professionals who want predictable inbox trust without manual steps. The tool uses realistic interactions and customizable settings to improve deliverability.
Key features
- Automated warmup automation, daily increases in activity
- Smart engagement simulation, realistic opens and replies from network inboxes
- Custom scheduling options, control when warmup actions occur
- Spam correction support, handles misplacements in spam folders
- Dashboard insights, quick view of progress and reputation signals
Pricing is not publicly disclosed
5. Warmup Inbox: best for individuals and small teams who want reliable inbox preparation
Warmup Inbox is a dedicated email warmup tool that helps new email accounts gain credibility before sending larger outreach volumes. It fits individuals, freelancers, and small sales teams who need better deliverability with minimal effort. The tool focuses on steady engagement and realistic email activity to improve reputation with inbox providers.
Key features
- Automated warmup sequence, scheduled daily interactions from day one
- Engagement simulation, opens and replies that mimic real responses
- Spam folder rescue, corrects misplaced messages
- Performance dashboard, track activity and reputation gains
- Multi inbox support, warm up several accounts at once
Pricing starts at $15 per inbox per month
6. InboxAlly: best for teams that want simple warmup with real replies
InboxAlly is an email warmup service that helps new inboxes build trust with providers through genuine engagement. It is ideal for sales teams, agencies, and solopreneurs who need inbox reputation before they send cold outreach. The tool focuses on real opens and replies to improve overall deliverability.
Key features
- Automated warmup schedule, consistent growth in daily activity
- Real replies from network, natural interaction signals
- Open and click simulation, realistic engagement behavior
- Spam folder correction, moves messages out of spam if needed
- Progress tracking, monitor improvements over time
Pricing starts at $149 per month
7. Mailreach: best for teams focused on deliverability and cold outreach
Mailreach is an email platform that combines warmup with cold campaign sending and analytics. It suits outreach teams and sales professionals who want stronger inbox trust before launching sequences at scale. The tool emphasizes actionable insights and realistic engagement to improve placement in primary inboxes.
Key features
- Automated warmup, scheduled daily interactions to build reputation
- Deliverability insights, data on inbox placement, and sender health
- Campaign builder, sequence creation and follow-up automation
- Engagement simulation, opens and replies from network participants
- Integration support, works with common email services and tools
Pricing starts at 25EUR per inbox per month
8. LemWarm: best for teams running cold outreach with Lemlist
LemWarm is an email warmup tool built to prepare new inboxes and domains before cold outreach starts. It is mainly used by sales teams and agencies that already rely on Lemlist and want deliverability handled in the background. The setup is simple and works well for outbound-focused workflows.
Key features
- Automated warmup emails, gradual daily sending increase
- Auto replies and opens, realistic engagement signals
- Spam recovery, pulls emails out of spam folders
- Inbox reputation tracking, basic visibility into warmup progress
- Native Lemlist connection, quick setup inside the Lemlist ecosystem
Pricing starts at $24 per email per month
9. TrulyInbox: best for solopreneurs and small teams who need focused warmup support
TrulyInbox is an email warmup service that helps new inboxes build credibility before sending outreach at scale. It works well for freelancers, consultants, and small sales teams who want deliverability improvement without complex setup. The tool emphasizes realistic inbox interactions to improve trust with email providers.
Key features
- Automated warmup emails daily sending growth for stronger reputation
- Realistic engagement simulation opens and replies from network inboxes
- Spam folder recovery identifies and corrects placement issues
- Warmup progress dashboard clear view of activity and results
- Simple setup process quick connection with most email services
Pricing starts at $15 per month for unlimited email accounts
10. Snov.io: best for outreach teams that want warmup plus lead generation
Snov.io is a multifunction outreach platform that includes email warmup alongside prospecting tools and campaign automation. It is ideal for marketing teams and sales pros who need to find leads, warm their inboxes, and launch email sequences from one place. The warmup feature helps protect deliverability before high-volume outreach.
Key features
- Email warmup automation, daily engagement to strengthen sender reputation
- Lead generation tools, find and verify prospects from multiple sources
- Campaign sequences, automated follow up and personalization
- Inbox analytics, track open rates and reputation signals
- Integration options, connects with CRM and other marketing tools
Pricing starts at $29.25 per month for three warmups
11. Quickmail: best for sales teams who want strong warmup plus outreach
QuickMail is an email platform that combines automated warmup with cold outreach and follow up sequences. It is geared toward sales reps and small to medium sized teams who want reliable deliverability and sequence control in one place. The tool helps users gradually build inbox reputation while managing campaigns.
Key features
- Automatic warmup, daily activity to build trust with inbox providers
- Sequence builder, customizable outreach steps
- Reply management, organize replies without manual sorting
- Inbox health insights, visibility into deliverability trends
- Multi inbox support, scale across team accounts
Pricing starts at $9 per month
12. Instantly: best for outbound teams needing combined outreach and warmup
Instantly offers cold email outreach with built-in warmup to help inboxes gain trust before sending real campaigns. It is ideal for small sales teams and agencies that want both warm-up and campaign sending from a single platform with automated engagement. The tool supports multiple inboxes and customizable sequences that include warm-up activity.
Key features
- Built-in warmup, automatic daily activity to build reputation
- Cold campaign management, sequence builder and follow ups
- Inbox engagement simulation, opens and replies from connected network
- Multichannel support, multiple inboxes in one place
- Analytics and deliverability tracking, monitor performance and inbox health
Pricing starts at $30 per inbox per month.
13. Artisan.co: best for teams that want a simple automatic warmup network
Artisan.co is an email warmup tool that uses a network of real inboxes to build trust for new senders before they begin outreach. It is suitable for startups, small sales teams, and outreach specialists who need better deliverability without manual warmup steps. The tool focuses on realistic interactions to improve inbox reputation over time.
Key features
- Automatic warmup messaging, daily increase in sending activity
- Real engagement simulation, opens, replies, and clicks from network inboxes
- Provider-agnostic support, works with most email services
- Warmup status dashboard, monitor progress easily
- Scalability options, add more inboxes as sending needs grow
Pricing is not available publicly
Wrapping up
Your sender reputation isn’t something that just happens. It’s something you build intentionally, and the starting point is using a solid email warmup service. Note that once you warm up emails, there are still a lot of moving parts to maintaining great email deliverability, and this is where Woodpecker comes in.
With Woodpecker, you get all the tools to stay out of the spam folder. From warmup to verification, sequences and workflows, you can turn email into a revenue-generating channel for your business.
Try Woodpecker today for free.