TL;DR:
- Validity is a trusted provider for marketing tools and it has recently acquired Litmus.
- This means Validity Everest, its deliverability leg, is now accessible within the Litmus platform.
- Validity provides access to deliverability insights and inbox placement.
- Warmy conducts AI-powered email warmup which proactively establishes your sender reputation to ensure higher inbox placement.
- If you’re looking specifically for a warmup tool, Warmy is the better choice.
In 2026, email deliverability isn’t just about monitoring data. It’s about taking action with the data you have.
Validity Everest has long been a popular provider of marketing tools. Its Everest solution provides visibility of sender reputation and other deliverability metrics. With Validity having acquired Litmus in 2025, the Everest features are now integrated within Litmus.
However, while Everest through Litmus provides deliverability insights on inbox placement and when your emails land in spam, Warmy.io actively pulls you out of that dreaded folder.
For sales teams, SDRs, agencies, and enterprises running cold outreach campaigns, this distinction makes all the difference between inbox placement and missed opportunities.
This comprehensive comparison breaks down the core differences between these two email deliverability platforms, helping you choose the right tool for your growth strategy.
Warmy vs Validity (Everest) through Litmus a glance
Before diving deep into features and pricing, here’s a quick comparison to help you understand the fundamental differences between Validity Everest and Warmy.io:
Feature | Validity Everest within Litmus | Warmy.io |
Primary focus | Comprehensive monitoring and analytics | All-in-one email deliverability solution |
Core product offering | Co-pilot for deliverability within the Litmus platform, allowing users to build, optimize, monitor, and analyze in one tool | AI-powered engine for email warmup, reputation building, and optimizing deliverability |
Deliverability strategy | Primarily diagnostic: Provides access to sender reputation and email metrics including SPF/DMARC tracking
Provides alerts on any issues that may impact deliverability | Both diagnostic and active: Automatically builds sender reputation through real interactions (either via network or Seed Lists) that send trust signals to ESPs
Provides real-time data on deliverability, sender reputation, DNS status, blacklist presence and provides features to optimize various factors affecting deliverability as a whole |
The table above highlights the fundamental divide: Validity Everest excels at diagnosis and monitoring for enterprise marketing teams, while Warmy.io provides active, AI-powered reputation building specifically designed for cold outreach and sales teams.
What is Validity’s approach to deliverability?
Validity Everest operates like a sophisticated medical diagnostic tool. Its features include:
- Inbox placement insights: Information on which email providers are sending your emails to the spam folder
- Infrastructure monitoring: Status of SPF/DKIM/DMARC records
- Comprehensive data reporting: Engagement analytics like open rates and devices used
- Customizable dashboards: Ability to focus on the metrics you want to prioritize
- Sender reputation: This includes data on sender score, blocklisted incidents, spam traps, and spam complaints
- Deliverability issues: Active problem areas and the domain or IP where the issue is (example: Missing Seeds or general deliverability)
- Seed Lists: Validity offers seed lists that users can upload into their ESP to test their current inbox placement. Additional features include optimization and weighing which allow users to specify the percentages per distributor so the seed list tests reflect actual inbox placement.
These are all crucial information to know. But here’s the problem: simply knowing you’re in spam doesn’t get you out of spam.
If you’re running time-sensitive cold outreach campaigns, this insight gap can cost thousands in lost opportunities. You’re paying premium prices for analytics that tell you what’s wrong but don’t fix the underlying issue.
Why traditional monitoring (Validity) isn’t enough anymore
Gmail, Outlook, and Yahoo’s recent bulk sender requirement updates fundamentally changed how ESPs evaluate email legitimacy. The new algorithms prioritize engagement signals over volume and traditional metrics:
- Reply rates: Do recipients respond to your emails?
- Click-through behavior: Are people engaging with your content?
- Conversation threads: Do your emails start meaningful exchanges?
- Moving from spam to inbox: Do recipients go the extra mile to rescue your messages from the spam?
This shift creates a chicken-and-egg problem for new domains and cold outreach:
- You need engagement to reach the inbox, but you can’t get engagement if you’re stuck in spam.
- At the same time, if your engagement rates are low, they will continue to decrease.
Traditional monitoring tools like Validity Everest can measure this problem but can’t solve it. This is the reality: most teams don’t need another dashboard showing them they have a problem.
You need a solution that actively works to improve deliverability while they focus on selling. This is where the fundamental difference between monitoring and action becomes critical.
The Warmy.io advantage: AI-powered warmup that actively pushes deliverability
Comparing Warmy and Validity Everest is like comparing email warmup vs deliverability monitoring. Warmy doesn’t just monitor your email reputation. It systematically analyzes the data and builds domain reputation through intelligent, automated engagement. Here are just some of Warmy’s features and capabilities:
Active reputation building through AI-powered email warmup
When you connect your inbox to Warmy.io, you are included in a network of real email accounts across multiple ISPs, industries, and locations. These actual email addresses are legitimate and active.
Then, Warmy conducts the automated email warmup:
- The system intelligently ramps up sending volume over time, starting with just a few messages per day and gradually increasing as your reputation improves.
- This mirrors the natural behavior of a new email user and avoids triggering sudden volume spikes that alert spam filters.
A G2 user calls Warmy “A Lifesaver for Email Deliverability” and says “Warmy has been a game changer for us! The team’s dedication and hands-on support was phenomenal. They didn’t just give general advice; they dove deep into helping us configure our DNS settings and even perfect our email templates.”
Positive signal generation
Here’s where Warmy.io truly differentiates itself: the AI doesn’t just send emails. It generates the engagement signals that modern ESPs prioritize.
Here’s what that looks like:
- Network emails automatically reply to your warmup messages, move them from spam to inbox when necessary, mark them as important, and maintain conversation threads over time.
- Every interaction trains Gmail, Outlook, Yahoo and other providers that your domain sends valuable, wanted email.
- Through consistent warmup, most domains see dramatic improvements in deliverability. Open rates for cold outreach campaigns typically increase and spam placement drops significantly all without any manual intervention from your team.
Warmup With Clicks is an add-on feature that adds natural interactions that weigh heavily when it comes to building trust signals. This feature adds clicks and scrolling, helping build stronger sender reputation and improve inbox placement. This goes beyond the basic warmup interactions most email warmup and deliverability tools provide.
Customizable warmup preferences such as language, topic, engagement pattern
Most email warmup tools only operate in English and only focus on generating the engagement signals while gradually increasing sending volume.
Warmy allows users to customize the language of emails (over 30 languages to choose from!), the topic (for added relevance), and even the engagement pattern to simulate (B2B vs B2C). Even the distribution of the warmup emails across various providers can be specified.
Together, these customization options help users build the right reputation for their industry, niche, and target recipients. For example, if most of your recipients are on Outlook, you can set your warmup to go to the majority of Outlook email addresses.
Scalability for teams and agencies
Digital marketing agencies and sales development agencies face a unique challenge: they need to manage email deliverability not just for their own domain but for dozens of client accounts simultaneously.
While Validity Everest provides data across multiple domains, it can be challenging for teams to implement corresponding actions simultaneously and manually across these many domains. Warmy’s Workspace Management and Agency Dashboard tackle this.
Teams can view deliverability health scores, warmup progress, and engagement metrics for all client accounts from a single dashboard. No more logging in and out of individual platforms or juggling multiple subscription accounts.
Book a demo today to see how Warmy works for teams.
Holistic domain health checks
If there’s one thing that keeps your emails consistently landing in inboxes, it’s domain health. Email deliverability has multiple layers that all play a factor. Aside from email warmup statistics, Warmy’s Domain Health Hub makes monitoring important metrics easily accessible.
With the Domain Health Hub, senders can view:
- A numeric health score based on key deliverability factors like inbox placement tests, DNS authentication, and Google Postmaster data.
- Spam rate trends, inbox placement, and overall deliverability performance with weekly or monthly tracking options
- Status of email authentication and security with comprehensive DNS Health Checks.
- Health of all your domains in one place, and easily zero in on which ones need urgent attention.
Additionally, Warmy users can also generate and receive detailed domain-level and mailbox-level reports of their inbox placement, spam rates, and overall domain health. This includes the deliverability and breakdown across providers, status of DNS records, spam rates, and warmup statistics.
Need help ensuring your SPF and DMARC records are valid? Try Warmy’s free SPF Record Generator and free DMARC Record Generator.
Feature-by-feature deep dive: Where each platform excels
While the strategic difference between monitoring and action is clear, it’s worth examining specific features to understand where each platform provides unique value.
Reporting & analytics: Depth vs. actionability
- Validity Everest provides detailed analytics including ESP-specific rates, reputation across blacklists, and authentication failure notifications.
- Warmy.io not only shows these data in real-time, but it also shows the data of the ongoing warmup progress. Additionally, Warmy provides customizable warm up strategies to suit specific needs and optimizes email warm up for the best results.
Integration ecosystem: Marketing automation vs. cold outreach
- Validity through Litmus integrates with many ESPs, productivity apps, and code editors as it positions itself as an all-in-one marketing automation workflow provider with built-in deliverability.
- Warmy integrates with the tools cold outreach teams actually use, such as Google Postmaster Tools. It also integrates with more than 100 email providers.
Use of seed lists
- Validity’s Knowledge Hub states that their seed lists can be downloaded by users and uploaded into their ESPs to conduct tests for inbox placement. The weighing option, as mentioned above, is to specify the distribution of seeds so the test parameters are as close to the sender’s actual contact databases.
- Warmy, on the other hand, has the Seed List feature which is not just for testing, but actual warmup and reputation building. These seed lists mimic the behavior of actual recipients which create a positive signal for ESPs. Users can download specific seeds per provider if you wish to double down on warming up a specific ESP.
Choosing your 2026 deliverability strategy
The Validity Everest vs. Warmy.io decision is all about which approach matches your organization’s needs. Choose Warmy.io if:
- You’re running large-scale cold outreach and want to maximize email’s ROI
- You need to improve inbox placement, not just monitor it
- You’re launching new domains or recovering from reputation damage
- You want set-and-forget automation without ongoing management
- You’re an agency managing multiple client inboxes
- You need cost-effective scaling for growing teams
The email deliverability landscape has evolved beyond simple monitoring. In 2026, success requires active engagement building, multilingual global reach, and AI-powered automation. For growth-focused teams who need results rather than reports, Warmy.io represents the future of email reputation management.
FAQ
Can Warmy.io replace Validity Everest completely?
Yes, if your primary goal is increasing deliverability through engagement rather than enterprise compliance monitoring. Warmy.io provides active reputation building, deliverability health scoring, spam placement tracking, and integration with cold outreach tools.
Does Validity Everest offer automated email warmup?
No. Validity Everest focuses on reputation monitoring, seed list testing, and deliverability analytics. It tells you when your reputation is declining and helps diagnose why, but it doesn’t actively warm your domains or generate the engagement signals that build reputation. If you’re using Everest and need warmup capabilities, you would need to either manually warm domains or add a separate warmup service.
Is email warmup compliant with Google and Yahoo’s sender requirements?
Yes. Warmy.io’s AI warmup actually helps you meet these requirements more effectively than manual approaches. The updates from Gmail and Yahoo emphasize engagement signals such as replies, conversation threads, moving emails from spam to inbox, and time spent reading. Warmy generates these signals through organic-style interactions. The system doesn’t violate any ESP policies because it uses real email accounts engaging in legitimate communication, just as a human would.
How long does it take to see results with Warmy.io?
Most domains see measurable improvements in 2-3 weeks of consistent warmup. New domains or those recovering from reputation damage may need 4-6 weeks for full optimization. The AI automatically adjusts the warmup pace based on your specific situation so newer domains start slower and ramp up gradually, while established domains can progress more quickly. You’ll see daily progress in your dashboard, with metrics like engagement rate and spam placement updating continuously.
Which platform should I choose: Warmy.io or Validity Everest?
Choose Warmy.io if you are a growth-focused team needing inbox placement improvements for cold outreach.
Can I use Warmy.io with my existing cold email tools?
Absolutely. Warmy.io integrates seamlessly with popular cold outreach platforms. You simply connect your email account to Warmy.io for warmup, then use your preferred outreach tool for actual campaigns. The AI warmup runs continuously in the background, improving your domain reputation while you send real sales emails through your existing workflow.
What makes Warmy.io’s multilingual support important?
If you’re running cold outreach campaigns in non-English markets, your warmup emails should match the language and communication style of your actual campaigns. ESPs like Gmail analyze language patterns, cultural communication norms, and regional engagement behaviors. Warmy.io’s 30+ language support ensures you build the right reputation signals for your specific target markets.
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