Warmy.io Review
Is it the best email warmup tool for businesses in 2025?
Get a full breakdown of Warmy.io pros and cons, features, user experience, and more in this email warmup tool review.
If your emails are bouncing or getting lost in the spam folder, you’re not generating revenue.
Whether you know it or not, email deliverabilityⓘA sender’s ability to reach the recipient’s inbox with their outgoing emails. It may also describe the ratio of emails delivered to the inbox vs. those sent to spam or blocked by the receiving server. is critical for any business that uses emails. That accounts for email marketers, sales teams, business development professionals, recruiters, and cold outreach specialists.
Warmy.io is a significant name in the email deliverability space thanks to its longstanding and feature-rich email warmup tool. But is it the most effective and affordable option for your business’s email needs?
Dive into this Warmy.io review to learn everything you need to know before signing up!
What is Warmy.io?
Warmy.io is a fully automated email warmup service that helps businesses and email senders improve their email deliverability and sender reputation.
Warmy.io was co-created by Daniel and Michael Schnaider and currently has offices in Tel Aviv, Israel, and Vinnytsa, Ukraine, with an additional presence in the United States.
The platform strives to provide a comprehensive email warmup solution with its core service and email seed list. It also emphasizes the use of AI with its engine dubbed ‘Adeline,’ which generates personalized email warmup plans tailored to the connected mailbox.
Warmy.io features
Warmy.io specializes in email warmup for email deliverability. The platform includes a variety of features that help automate and personalize the tool to your unique needs.
Here’s a breakdown of those features.
Fully automated email warmup tool
Warmy.io warms up business emails by automatically engaging with those emails to send positive engagement signals to internet service providers.
Using artificial intelligence dubbed ‘Adeline,’ the email warmup tool automatically generates a personalized warmup plan for the connected mailbox. It considers factors such as your current sender reputation, sending volume, average engagement rate, and your intended goals.
Once your personalized plan is established, it begins sending emails from your mailbox and gradually increases the volume of that sending over time. Warmy.io interacts with these emails to boost your campaign engagement via opens, clicks, and replies. It will also mark any emails sent to the spam folder as “not spam.”
After accruing a significant amount of these positive signals, internet service providers are trained to trust the email content coming from your mailbox, boosting the likelihood that your emails will go to the inbox.
Auto-generated, personalized emails
When selecting an email warmup tool, it’s important to know what type of content is found in the emails they send on your behalf. Internet service providers are aware of tools like these and are on the lookout for obviously spammy emails.
In other words, if the email warmup tool sends an email with nonsensical, spammy text, it’s far more likely to hurt your reputation than to help.
Warmy.io aims to solve this problem by creating personalized emails tailored for the connected inbox. This aids the process of ensuring that these warmup emails look and feel authentic to internet service providers.
Warmy.io uses a network of customers
To provide positive engagement signals, Warmy.io exchanges the emails you send with other real users. Any time a warmup email is sent from your mailbox, it goes to an inbox owned by another customer within Warmy.io’s network.
Warmy.io handles the interaction and keeps these emails non-visible and out of the way of your daily business. It also limits what it can access to protect your privacy and prevent unauthorized hands from touching your data.
Email topics tailored to the industry
In addition to its personalized email content feature, Warmy.io’s Adeline AI also creates topics relevant to your industry. If you’re a SaaS business, it will create emails that look and feel like a typical SaaS B2B email.
While this feature is available, note that the effectiveness of specific industry or topic warmup is debated. Realistically, there are no downsides to personalizing these emails, but it’s unclear if it actually provides a meaningful impact.
Language-based warmup
Finally, Warmy.io creates warmup emails in your desired language. This feature may be ideal for businesses that do business in different languages or a language other than English.
A dedicated email warmup reporting dashboard
As Adeline performs your email warmup, your dashboard will automatically populate with a variety of statistical data and analyses regarding the performance. This data includes helpful insights, such as
- The number of emails sent and received daily
- The percentage of emails reaching spam vs. the inbox
- A graphical breakdown of your warmup email activity by date or period
- Authentication alignment checks for SPF, DKIM, and DMARC
- Real-time blacklist monitoringⓘA service that actively observes your email domain and IP address while comparing it to known email blacklists and antispam services around the internet. If a blacklist flags either the domain or IP, the monitor will notify the user.
- Your current mailbox “temperature” (refers to your overall deliverability score and improvement)
Warmy.io’s clean dashboards make it easy to check in on each of your synced mailboxes.
Email seed list
Another way to receive the benefits of email warmup is to use a list of seed email addresses. These are privately owned addresses that are used to assess the email deliverability of a mailbox.
Warmy.io gives the option to download their seed list. Before sending their next email campaign, users can send it to this list of addresses to automatically receive positive engagement signals like opens, clicks, and spam removal.
Using a seed list is a manual process, but it could improve the email deliverability of your campaign.
Warmy API
Finally, Warmy.io is one of the few email warmup tools that grants users the ability to customize how they use their email deliverability tools with an open API.
An open API aids businesses and developers by eliminating the need for complex coding and, instead, allows it to connect with your website or platform via your unique API key. The company also provides customer support and documentation for the email warmup API.
Who is the ideal Warmy.io user?
Warmy.io and email warmup tools are ideal for any business that relies on email in any capacity. Your emails must reach their intended audience to generate impact and revenue. Email warmup helps them land in the inbox and avoid getting lost forever in spam where the average reader will not look.
Warmy.io can benefit
- Sales teams, particularly those who perform cold outreach campaigns
- Email marketers
- Digital marketing agencies
- Business development representatives
- Recruiters
- Law firms and legal teams
Warmy.io is also one of the few platforms that work directly with agencies via white labeling. This process allows an agency to sell the Warmy.io service as its own under different branding to increase the value of its offerings to potential clients.
Warmy.io pricing
Warmy.io currently offers five different plan tiers. With each tier, you gain access to additional features.
Warmy.io pricing is also incrementally discounted as you add more accounts to warm up. If you choose to subscribe annually, you’ll receive two of those months at no cost.
Warmy.io customer feedback
With Warmy.io’s pricing and features listed, let’s take a look at customer reviews for the platform. The following analysis comes from aggregate business review websites, including Capterra.
Though Capterra has fewer user experiences on record, these Warmy.io users love the service. For this list of Warmy.io pros and cons, we have:
Pros
- Simplicity and ease of use
- Tangible improvements to email deliverability and engagement
- Responsive and supportive customer service
- Fast and reliable results
Cons
- Price point
- Some minor issues with setup
- Delayed alert times
Warmy.io security & compliance features
Currently, Warmy.io doesn’t publicly disclose too many of its security accreditations or features. However, they do call attention to this and request that you submit a ticket to their support team for more detailed information regarding your needs. The team also cites that it is actively working towards SOC compliance.
Want a quick overview comparison of Warmy.io and ZeroBounce?
Warmy.io alternatives and more email warmup tool reviews
There are more high-quality email warmup service options available, and we reviewed them. Use the links below to check out our detailed reviews of some of the internet’s top-rated email warmup tools.
ZeroBounce
ZeroBounce offers an email deliverability toolkitⓘZeroBounce’s package of email deliverability tools and services, which includes the following: Warmup, DMARC Monitor, Email Finder, Blacklist Monitor, inbox placement testing, and email server testing. all under one subscription. This toolkit includes essentials for maximizing email deliverability, testing email campaigns, and finding new business leads.
Customers can also contact the ZeroBounce team to build a customized plan that fits their company’s unique email needs.
Other notable features of ZeroBounce’s Warmup service include the following:
Email warm-up for any mailbox that supports SMTP connections
Warm-up is performed with privately owned seed email addresses; your warm-up emails are never sent to other customer inboxes
Category monitoring to track which emails go to the inbox vs. spam
Wholly automated with the ZeroBounce-managed method or more advanced settings and control with the user-managed method
Seamless sync up with other toolkit tools like DMARC and Blacklist Monitor for additional reputation tracking
Dedicated email warm-up dashboard to track inbox score and email deliverability improvements over time
Try ZeroBounce for email warm-up
Popularized by its industry-leading email validationⓘA process that determines if an email address uses valid syntax, exists on a given domain, and is configured to receive incoming email messages tool, ZeroBounce offers a complete package of tools to help 400,000+ businesses worldwide achieve optimal email deliverability.
Give the platform a try today – create a free account now to get started.
Contents
- to find more details about links
- What is Warmy.io? to find more details about links
- Warmy.io features to find more details about links
- Who is the ideal Warmy.io user? to find more details about links
- Warmy.io pricing to find more details about links
- Warmy.io customer feedback to find more details about links
- Warmy.io security & compliance features to find more details about links
- Warmy.io alternatives and more email warmup tool reviews to find more details about links
Frequently asked questions
Warmy.io is an automated email warmup service designed to improve a business’s email deliverability. Users can subscribe monthly or annually and warm up as many mailbox accounts as needed simultaneously.
Warmy.io provides email warmup to businesses, recruiters, and agencies to help their emails stay out of the spam folder. It does so via its AI-driven email warmup service using its self-owned and created AI, Adeline, as well as through its email seed list. Warmy.io gradually increases the volume of emails sent from your connected mailbox while sending positive engagement signals through those emails by opening, clicking, and replying to them.
Email deliverability is your ability to send and deliver emails to the inbox folder. Internet service providers determine your email deliverability through a number of factors, including domain sender reputation, bounce rates, campaign engagement, spam complaints, email authentication records, and email blacklists. By maintaining optimal email deliverability, more emails are successfully delivered to the inbox, not to the spam folder.
Email warmup works by sending automated emails from your connected mailbox. These emails are delivered to real email inboxes or seed email addresses. When your warmup emails are delivered (either to the inbox or spam), they receive positive engagement, such as opens, clicks, and replies, and are marked as important. Over time, these positive signals train internet service providers to view your email domain as safe and trustworthy.
Warmy.io customers and users rate Warmy.io highly on platforms like G2 and Capterra, with ratings of 4.8 and 4.9 stars out of 5, respectively. Customers cite positive experiences with the email warmup service, ease of use, and quality customer support. The cons primarily pertain to pricing and difficulty troubleshooting setup and alerts.