Email warmup is essential for any email marketing strategy to succeed. This is particularly true for businesses conducting cold outreach.
While cold emails are a vital tool, implementing cold outreach improperly can lead to long-term damage. Emails can land in the spam folder if not warmed up properly. Worse, senders’ domains may be blacklisted and blocked for good by email service providers.
This is where tools like Warmy and Warmup Inbox come in. But which one offers the best solution for your business?
You’re probably here because you’re looking for a Warmup Inbox alternative. Or maybe you’re still browsing warmup tools. Regardless of the reason, you’re in the right place.
Let’s dive into the key features, benefits, and differences to help you make an informed choice.
Warmup Inbox

Warmup Inbox is a platform dedicated to optimizing email deliverability. It aims to raise your sender reputation by gradually warming up email inboxes to get your emails to land in your audience’s inbox.
Warmup Inbox features
Here’s a quick rundown of what Warmup Inbox offers:
- Email warmup: Warmup Inbox mentions that they use more than 30,000 real email accounts to send and receive warmup emails. This is supposed to establish a good sender reputation and keep your emails out of spam in the long run.
- ESP-specific warmup: This feature is targeted towards senders who want to build trust with specific ESPs only.
- Language-specific warmup: Warmup Inbox mentions 12 different languages senders ca use to tailor their warmup approach to their global audience.
- Cold email sequence tool: This tool allows senders to design custom sequences with multiple follow-up emails and specific schedules that can be automated.
- Free tools: Warmup Inbox also offers a variety of free tools to help with overall deliverability, such as a DMARC Generator, SPF Generator, AI email writer, blacklist checker, and spam words checker.
Warmup Inbox limitations
There’s no question about it—Warmup Inbox does work, though there are a few caveats that many users have noticed.
- The warmup process can be too aggressive. Users reported they were suspended by Google within 24 hours of using Warmup Inbox. Another user says he was instantly banned on Outlook.
- Very limited features in the free trial. Some users reported that senders can’t do much during the free trial, which gives them a hard time envisioning how Warmup Inbox can actually work for them.

- The ESP and language warmup are only accessible for the most expensive pricing tiers
- Customer service seems to be understaffed as they respond within 24 hours but rarely provide solutions.
- User interface is a bit outdated.
Warmup Inbox pricing
Warmup Inbox has three pricing plans:
- Basic ($19/month/inbox): 75 warmup emails per day
- Pro ($59/month/inbox): 250 warmup emails per day
- Max ($99/month/inbox): 1,000 warmup emails per day
Overall, pricing is a bit on the expensive side, as you will have to keep paying more if you want to move into higher-scale sending.
Warmy.io: the best Warmup Inbox alternative

Warmy.io is an advanced email warmup platform designed to improve email deliverability with AI-powered technology.
Warmy’s comprehensive solution goes beyond traditional warmup services. Small startups and large enterprises alike will benefit from the scalability and flexibility offered by Warmy.
Warmy’s email warmup service offers several key benefits that are not available through other services.
Overview of Warmy features
Here’s why Warmy is the leading warmup tool right now in the market:
Automated and robust warmup

Yes, Warmy ensures that warmup emails are delivered. But Warmy also ensures these emails are opened, marked as important, and replied to. The system is built on real B2B mailboxes that simulate genuine B2B conversations. This ensures a sustainable sender reputation over time.
Warmy.io’s platform is fully automated, with the AI engine “Adeline” managing the warmup process at an optimal pace. A comprehensive dashboard is also available for users to monitor deliverability performance. Additionally, Warmy’s system can warm up emails in over 30 languages.
Customizable warmup preferences

This feature makes the email warmup process smarter, more customizable, and tailored to your needs. This feature allows:
- Customization of percentage of emails that will be sent to each provider: GSuite, Gmail, M365, Outlook, Yahoo, and even Private SMTP.
- Ability to choose between B2B or B2C customers when it comes to engagement patterns.
- Setting of warmup settings for all your mailboxes at once or even one by one.
Advanced seed lists for genuine warmup

Warmy’s Seed List feature, now called Warmup With Clicks, gives a more human-like approach that sends strong positive engagement signals to different email providers. It is composed of real active email accounts from Premium Google, Outlook, and Yahoo.
These seeds are consistently updated and maintained to ensure validity and authenticity. Engagement signals include email opens, scroll throughs, link clicks, and even spam recovery. In case any of your emails land in spam, our AI system will manually retrieve it, then will mark it as important to establish a good reputation.
Domain Health Hub

With Warmy’s Domain Health Hub, senders can monitor all their domains in one dashboard:
- Domain health score based on various factors like authentication, blacklist status, and inbox placement tests.
- Spam rate trends and deliverability performance with weekly or monthly tracking options so users can visualize trends and patterns.
- Comprehensive DNS status checks (SPF, DKIM, DMARC, rDNS, MX, and A records) for stronger authentication & security.
- Quick access to a detailed breakdown of health metrics, performance reports, and deliverability trends per domain.
Free tools from Warmy
- Free email deliverability test: Know the percentage of emails that ends in spam, promotions, inbox, and unreceived across major email providers. It also reveals if your domain or IP is listed anywhere on any blacklists.
- Template Checker: Assess if email content is likely to be flagged by spam filters, enabling you to make necessary adjustments before sending.
- SPF Generator: Automatically generates the correct SPF record based on your email service providers while ensuring compliance with best practices to avoid SPF misconfigurations.
- DMARC Generator: Creates a valid DMARC record based on your email security needs.
Feature-by-feature comparison: Warmy vs Warmup Inbox
Warmy.io
Warmup inbox
Email providers and SMTP
- Both Warmy and Warmup Inbox cater to a broad range of email providers, ensuring flexibility for users with diverse email setups.
- Warmy’s customizable SMTP configurations offer an added layer of adaptability for complex email systems.
Warmup volume
- Warmy is designed to support up to 150,000 warm-up emails per month, making it an ideal choice for businesses with extensive email marketing operations or those needing significant email volume management.
- On the other hand, Warmup Inbox supports warming up to 30,000 emails per month, offering a robust solution that balances effectiveness with considerable volume capacity.
- This distinction highlights Warmy’s capability for larger-scale operations, while Warmup Inbox provides a substantial volume that caters to medium to large businesses focusing on building and maintaining their sender reputation effectively.
Ease of use
Warmy and Warmup Inbox are designed with user experience in mind, featuring intuitive interfaces that simplify the email warming process for users of all technical levels.
Integration capabilities
Both tools offer integration capabilities, with Warmy showcasing a broader range of integrations with popular platforms and services, enhancing its appeal to users with complex marketing tech stacks.
Blacklist monitoring
- Warmy includes detailed blacklist monitoring as part of its comprehensive approach to email deliverability, offering users insights into their sender reputation. For those availing the free email deliverability test, presence on any blacklists is also included in the report.
- The specifics of Warmup Inbox’s blacklist monitoring capabilities are not detailed but are inherent in its warming process.
Free trial
Warmy offers a 7-day free trial, inviting users to explore its features, while Warmup Inbox also provides a 7-day free trial, allowing potential customers to assess its warming effectiveness firsthand.
Feedback and reviews
Warmy.io:
- On G2, Warmy.io has received 4.8⭐ out of 5 stars
- On Trustpilot, Warmy.io has a great rating of 4.6⭐ out of 5 stars
- On Capterra, Warmy.io is rated 4.9⭐ out of 5 stars
Warmup Inbox:
- On Trustpilot, Warmup Inbox has an average rating of 4.6⭐ out of 5 stars
- On G2, Warmup Inbox is rated 4.7⭐ out of 5 stars
- On Capterra, Warmup Inbox has an overall rating of 4.6⭐ out of 5 stars
Scalability and customization
- Warmy is built to scale, supporting businesses as they grow with customizable options to meet specific needs.
- Warmup Inbox focuses on effectively warming inboxes, with scalability implied through its service’s nature.
Choose the best for your email deliverability!
Both Warmy and Warmup Inbox offer commendable solutions.
However, when diving deep into the features, integration capabilities, user experience, and overall effectiveness, Warmy.io emerges as a more holistic platform.
Its innovative approach, combined with its user-centric design, ensures that emails not only reach their intended recipients but also foster trust and engagement.
Choose a platform that’s been tried, tested, and trusted by many. Make the switch to Warmy.io today and experience the difference firsthand. Start your free trial today.