Top 6 AI Tools for B2B Email Deliverability

Every day, millions of sales and outreach emails are sent, yet nearly 46% end up in spam. 

That means half of your potential conversations never even reach the people you’re trying to connect with. The message, the offer, the effort, all wasted before it’s seen.

Deliverability determines whether your emails start a conversation or die unseen. That’s where AI deliverability tools make the difference. 

They help teams resolve domain issues, monitor their reputation, and ensure every message has a fair chance of reaching the inbox. 

But not every platform treats deliverability as a priority. Some bolt on “warm-up” as an extra feature. Others are designed for volume, not long-term inbox placement.

In this guide, we’ll compare the leading tools B2B teams use to secure inbox placement. 

We’ll focus on the features that matter most for outreach, warm-up, inbox placement testing, reputation monitoring, spam checks, and domain health, so you can find the right tool for you. 

Top 6 AI Tools for B2B Email Deliverability

MailReach

MailReach is a B2B email deliverability platform built to keep your outreach emails in real-inboxes. It automates through real Google Workspace and Office 365 interactions, runs spam placement tests, and monitors sender reputation in real time with its AI assistant, Co-Pilot. 

Key features

• Uses a network of 30,000+ real Google Workspace and Office 365 inboxes to send, open, reply, mark as important, and even rescue emails from the spam folder.
  
  
• Its fine-tuned algorithm gradually increases sending volume, using machine learning to vary timing, subject lines, and reply patterns that mimic human behavior.
  
  
• Run one-off or scheduled tests across major providers using its built-in spam checker. It shows exactly where your emails land, whether in the Inbox, Promotions, or Spam, before you launch a campaign.
  
  
• Automatically verifies SPF, DKIM, and DMARC records. Flags any issues with setup and monitors blacklist status so you can fix problems before they escalate.
  
  
• Tracks placement trends and sender reputation in real time with its Co-pilot feature. It sends alerts if deliverability declines, giving teams a chance to adjust their strategy before issues escalate
  
  
• Built for agencies and developers, the email warmup API makes it easy to scale warm-up across multiple inboxes, automate workflows, and integrate deliverability into existing sales or CRM systems.
  
  

Ideal for

• Safely warming up new domains before launching sales campaigns
  
  
• Repairing sender reputation when email sequences start landing in the spam folder.
  
  
• Managing deliverability at scale for agencies and multi-seat SDR teams.
  
  

Pricing

Starts at around $25 per mailbox/month, with scalable plans for teams and agencies.

Warmy.io

Warmy.io is an AI-driven email warm-up and deliverability tool that simulates human behavior to improve sender reputation. It automatically increases sending volume, opens, replies, and rescues emails from spam, helping users build inbox trust through AI-paced, realistic engagement patterns.

Unlike MailReach, its network includes both business and consumer inboxes, making it less precise for B2B-only outreach. Still, its AI pacing and diagnostic tools make it a decent option for general use across multiple email providers.

Key features

• AI-driven warm-up that adjusts sending speed based on domain age, inbox maturity, and reputation signals.
  
  
• Engages with real inboxes through opens, replies, spam rescues, and other positive interactions.
  
  
• Includes a deliverability checker, email health test, and template analyzer to identify potential spam triggers.
  
  
• Provides diagnostics for domain health and authentication (SPF, DKIM, DMARC).
  
  
• Compatible with Gmail, Outlook, Yahoo, Zoho, and SMTP services like SendGrid, Amazon SES, and Mailgun.

Ideal for

• New domains that need to build reputation quickly with minimal manual oversight.
  
  
• Teams operating across multiple ESPs who prefer a fully automated setup.
  
  

Pricing

The pricing is not publicly disclosed. According to G2, plans start at $49 per inbox/month, with enterprise-level plans for large-scale senders.

Mailivery

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Mailivery is an email warm-up and deliverability tool that helps users improve inbox placement by simulating real human interactions. It sends, opens, and replies to emails through a peer-to-peer network of real inboxes, gradually strengthening sender reputation.

Unlike advanced AI-powered tools, Mailivery automates basic interactions to gradually rebuild domain credibility, making it a simpler option for freelancers, startups, and small teams that want to boost deliverability without complex configuration. 

Key features

• Allows users to manually set daily warm-up interactions, timing, and growth rate.
  
  
• Provides basic analytics to track inbox vs. spam placement trends.
  
  
• Limited domain health checks; primarily boosts reputation through engagement signals.
  
  
• Dashboards display reductions in spam rates and gradual improvements in inbox placement over time
  
  
• Works with all major ESPs and SMTP/IMAP providers.
  
  

Ideal for

• Entry-level option for startups or solo operators testing cold outreach.
  
  
• Not ideal for multi-seat SDR teams or agencies that need adaptive AI-driven warm-up and monitoring.

Pricing

Starts at $29 per inbox/month.

Lemwarm

Lemwarm is an AI-assisted email warm-up and deliverability tool developed by Lemlist. It helps users improve sender reputation by automatically sending, opening, and replying to emails across a large network of real inboxes.

Lemwarm monitors deliverability scores, checks DNS and authentication records, and provides alerts if emails start landing in spam. While it includes AI features like smart content generation and industry-based clustering, it uses surface-level AI content variation rather than real engagement signals. This can harm deliverability by creating patterns that don’t mirror genuine user behavior.

The issue: these are cosmetic AI tricks that don’t improve inbox placement, and in some cases can even harm deliverability by introducing unnatural subject/body variations that don’t reflect how your real campaigns behave. For B2B outreach, this means Lemwarm’s warm-up can create noise without building the trust signals you actually need.

Key features

• Smart content algorithm generates unique subject lines and email body text.
  
  
• The “Smart Cluster” feature matches warm-up interactions by industry to better mimic real business context.
  
  
• The deliverability dashboard tracks spam rate, inbox placement percentage, and overall deliverability score.
  
  
• Auto-verifies DNS/SPF/DKIM records and monitors blacklist status.
  
  
• Sends automatic alerts when deliverability drops, so you can take action before your domain reputation is affected.
  
  
• Integrated directly with Lemlist outreach sequences; also works with Gmail and Outlook mailboxes.

Ideal for

• Teams already using Lemlist who want deliverability features built into their outreach tool.
  
  
• Not ideal if your priority is reputation-first deliverability, as cosmetic AI features may not translate into genuine inbox trust.

Pricing

Starts at $29/month.

Folderly

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Folderly is an AI-powered email deliverability and monitoring platform designed to help businesses improve inbox placement and protect sender reputation. It analyzes technical factors such as DNS, SPF, DKIM, and DMARC, detects spam triggers, and provides actionable recommendations to fix issues.

Folderly also offers inbox placement testing, real-time alerts, and expert-backed support to resolve complex deliverability problems. It’s primarily used by sales and marketing teams to ensure their outreach and transactional emails consistently reach recipients’ primary inboxes.

While valuable for enterprises with high stakes and budget, it’s not a direct competitor to MailReach’s AI-driven warm-up and Co-Pilot features that adapt in real time.

Key features

• Smart warm-up engine paired with daily deliverability monitoring.
  
  
• Continuous feedback and real-time alerts (via email, Slack, SMS) when emails hit spam.
  
  
• Automated inbox placement testing across ISPs with spam trigger analysis.
  
  
• In-depth DNS/SPF/DKIM/DMARC verification, along with domain/IP reputation scoring, and blacklist monitoring.
  
  
• Granular insights through Inbox Insights, Domain/IP health dashboards, and spam content analysis.
  
  
• Supports multiple mailbox warm-up at scale across any ESP/SMTP provider.

Ideal for

• Enterprise sales orgs or high-stakes senders who want a partner team to monitor deliverability.
  
  
• Less suited for SDR pods or agencies that prefer a fully AI-driven, scalable warm-up system like MailReach.
  
  

Pricing 

Pricing starts at $120 per inbox/month.

Warmup Inbox

Warmup Inbox is an automated email warm-up tool that helps users improve sender reputation and inbox placement. It connects to your email account and sends real, human-like interactions, such as opening, replying, and marking emails as important, across a network of 30,000+ inboxes.

The platform creates real-looking inbox interactions that improve sender consistency, not just volume. It tracks a reputation score, alerts users to deliverability issues, and helps prevent emails from landing in spam.

Key features

• Sends warm-up emails and simulates interactions such as replies, marking important, and rescuing emails from spam.
  
  
• Operates through a network of 30,000+ real inboxes.
  
  
• Tracks mailbox health using a Reputation Score benchmarked against community averages.
  
  
• Issues instant warnings if deliverability risks arise or reputation drops occur.
  
  
• Compatible with Gmail, Outlook, and SMTP-based ESPs.
  
  
• Optimized for Gmail’s Primary tab to maximize email visibility.
  
  

Ideal for

• Early-stage teams or budget-conscious users who need a low-cost, low-touch warm-up solution.
  
  
• Less effective for SDR pods or agencies that need adaptive AI-driven deliverability management.

Pricing 

Starts at $19 per inbox/month, with a free trial option available.

What to Look For in an Email Deliverability Tool

Choose an email deliverability platform that applies AI to protect your sender reputation and keep your sequences out of the spam folder. Here are the key features to look for:

• Quality of the warm-up network: Ensure the network includes real, active Google Workspace and Office 365 inboxes, the providers that matter most for B2B deliverability. Positive interactions from these sources are what truly strengthen your sender reputation.
• AI-paced warm-up, not cosmetic AI: Look for systems where AI adjusts warm-up speed based on domain age, inbox reputation, and sending history. That’s different from “AI” that only generates subject lines or generic body copy.
  
  
• Reputation monitoring: Dashboards with vanity “scores” don’t help. You need a tool that tracks your reputation daily across providers, flags blacklist appearances instantly, and recommends corrective action and sends you alerts when intervention is required.
  
  
• AI that simulates real engagement: The best systems open emails, reply naturally, pull them out of spam, and mark them as important, mimicking human interactions that ISPs trust.
  
  
• Scalability for sales teams and agencies: B2B outreach typically uses multiple inboxes. Your tool should support multi-inbox warm-up, role-based access, or API hooks so SDR pods and agencies can manage deliverability at scale.

Difference Between Traditional and AI Deliverability Tools

Traditional deliverability tools are built around automation, not intelligence. They follow fixed rules: sending a few emails per day, opening them automatically, marking them as important, and increasing volume gradually. 

While that helps new inboxes look active, it doesn’t adapt to how mailbox providers actually evaluate reputation over time. These tools are static, they don’t learn, adjust, or alert you when your deliverability starts to slip.

AI-driven deliverability tools, by contrast, learn from live performance data. They monitor how each provider responds to your activity and dynamically adjust sending volume, timing, and interaction types. 

Instead of a flat warm-up schedule, AI pacing adapts to domain age, past engagement, and reputation signals. Many also include diagnostic intelligence such as real-time alerts, spam test feedback, and authentication monitoring, so you can fix issues before they snowball.

These differences are critical for B2B outreach teams who rely on consistent inbox placement. Static automation might get you started, but only adaptive AI can help you stay in the inbox as your reputation and volume scale.

Which is the Right Tool For You?

A sudden spike in volume, a misconfigured record, or a dip in engagement can push your emails from inbox to spam overnight. 

That’s why deliverability can never be fixed once. It has to be monitored continuously.

But manual monitoring comes with its own limits. Checking DNS settings, tracking blacklists, and testing inbox placement across providers is time-consuming and often reactive. 

Most teams only notice a problem when reply rates fall or campaigns stop performing, by then, reputation damage has already begun.

This is where AI-driven deliverability tools make the difference. They observe patterns, learn from every send, and make micro-adjustments in real time. Instead of reacting after a drop, they prevent one, alerting you the moment deliverability trends shift.

For B2B outreach teams, that’s the real edge: a self-learning system that keeps your reputation steady.    

Try MailReach to secure inbox placement and protect your B2B campaigns.