Best Email Deliverability Tools In 2026 [Categorized + Tested

For many senders, we’re talking 14-17% of legitimate marketing emails failing to reach the inbox — going to spam or going missing entirely. If you’re a new sender or have reputation issues, the number can spike significantly higher.

As an email deliverability consultant who has helped businesses improve inbox rates, I’ve tested dozens of tools that promise to fix this problem. Most fail (sending generic warmup emails that don’t match your sending style). Some work (but cost more than they’re worth). A few are exceptional.

In this guide, I’ve covered the best email deliverability tools, categorized into: 

• Email warmup tools that build real reputation
• Testing platforms showing exactly where emails land
• Validation APIs catching spam traps before they kill your domain

Pick based on what’s broken (not what’s trendy).

TLDR: Best email deliverability tools compared

Here is a quick overview of our email deliverability tools in our list stack up:

Tool	Category	Best for	Starting price	Key strength
EmailWarmup.com	Warmup	Personalized warmup	$0 (Free forever)	AI-powered campaign matching
TrulyInbox	Warmup	Unlimited accounts	$0 (Free) or $22/month	Budget-friendly scaling
Warmy	Warmup	Language-specific warmup	$49/month	30+ language support
InboxAlly	Warmup	Reputation repair	$149/month	Advanced engagement simulation
Email Deliverability Test	Testing	Free placement testing	$0	Unlimited free tests
Email Spam Checker Extension	Testing	Real-time monitoring	$0	Live inbox/spam tracking
GlockApps	Testing	Comprehensive analysis	Free or $59/month	Detailed spam scoring
MxToolbox	Testing	DNS diagnostics	Free or $129/month	Blacklist monitoring
Folderly	Testing	Automated monitoring	$120/mailbox	Real-time alerts
Email Validation API	Validation	Dual verification	Custom	API-based validation
ZeroBounce	Validation	All-in-one toolkit	$18/month (2K credits)	Comprehensive features
Clearout	Validation	AI-powered accuracy	$14 (3K credits)	99% accuracy guarantee
Bouncer	Validation	Toxicity detection	$8 (1K credits)	99.5% verification rate

Warm-up and reputation-building

When your emails are going to spam, the problem often starts with sender reputation. These tools rebuild trust with mailbox providers through intelligent engagement patterns that prove your domain is legitimate.

1. EmailWarmup.com

Most warmup tools send generic emails that don’t match your actual sending patterns — which damages the reputation you’re trying to build. 

EmailWarmup.com analyzes your actual campaigns in real time and replicates them with AI assistance, since ESPs reward consistency between warmup and real sends.

The platform uses AI engines, including GPT-5, supervised by copywriters who understand human communication patterns (not just keyword stuffing). 

Your warmup emails match your sending style and look natural. A SaaS client saw inbox rates jump from 42% to 96% in three weeks — backed with a full refund guarantee.

Key services offered by EmailWarmup.com

What you get (and why it matters):

• Unlimited free deliverability testing (others charge $25-85/month)
• Real-time spam checker extension for Gmail/Outlook
• Personalized warmup mirroring your sequences
• Technical setup for SPF, DKIM, DMARC
• Deliverability consulting services
• Free consultation calls

EmailWarmup.com pricing

• Free Forever: $0 — 1 mailbox (70% inbox rate), unlimited tests, spam checker, consultation
• Pro: $19/mailbox — Unlimited mailboxes (>99% inbox rate claimed), all features

Pros & cons of EmailWarmup.com

Here’s what customers gain and where the tool falls short:

Pros	Cons
Personalized warmup matches campaigns	Newer platform
Unlimited free testing	Pro features need paid plan
Free consultation for all users	Learning curve exists
Real-time spam monitoring	—

What users say about EmailWarmup.com

One marketing agency managing multiple client domains said unlimited consultation saved them from having to hire a dedicated specialist. The spam checker extension gets praised most — showing placement across major providers removes guesswork from optimization.

2. TrulyInbox

TrulyInbox focuses on one thing — connecting unlimited email accounts without charging extra per inbox. Most warmup tools charge $15-50 per mailbox, which gets expensive fast when you’re managing multiple domains or client accounts.

The platform uses human-like engagement to build sender reputation — opening emails, replying, starring messages, and marking them as important. 

One reviewer who tested it for 2 months saw new accounts improve in 3-4 weeks, while older accounts with reputation damage took 2-3 weeks.

Key services offered by TrulyInbox

TrulyInbox delivers focused warmup functionality:

• Deliverability score tracking and monitoring
• Multiple email opens to mimic genuine engagement
• Compatible with Gmail, Outlook, Zoho, and custom SMTP
• Customizable settings for daily volume, ramp-up speed, and reply rates
• Automated warm-up with gradual volume increases
• Auto-stop feature if authentication issues detected

TrulyInbox pricing

The unlimited account model stands out:

Plan	Cost	Features
Free Forever	$0	10 warmup emails/day, basic features
Starter	$22/month	100 warmup emails/day, unlimited accounts
Growth	$79/month	1,000 warmup emails/day, unlimited accounts
Scale	$189/month	3,000 warmup emails/day, unlimited accounts
Business	$217/month	5,625 warmup emails/day, unlimited accounts

Pros & cons of TrulyInbox

Here’s what customers gain and where the tool falls short:

Pros	Cons
Unlimited accounts at a flat rate	Limited features beyond warmup
Budget-friendly for agencies	Gmail integration issues reported
Simple setup (under 5 minutes)	Customer support complaints
AI-generated personalized emails	Results plateau for some users
Free plan available	—

What users say about TrulyInbox

User feedback splits between appreciation for the pricing model and frustration with support. One verified user praised mimicking human-like replies, while another noted issues with support and connection. The consensus is that it works well when paired with good sending practices.

3. Warmy

Warmy distinguishes itself through AI-powered warmup in 30+ languages — a critical feature if you’re targeting specific geographical regions. 

The platform automatically generates personalized messages focused on industry-related topics, using engagement data to refine the strategy over time.

A finance specialist called it their favorite warm-up provider and praised the “reliable and informative platform” and its great support. However, some users note that the platform lacks deep customization for warm-up settings.

Key services offered by Warmy

The platform combines warmup with monitoring:

• AI-powered automated warmup
• Integration with Google Postmaster Tools
• Language-specific warmup in 30+ languages
• Inbox placement tests across major providers
• Weekly autotests and DNS record monitoring
• Email authentication tools and reporting
• SPF and DMARC generators

Warmy pricing

The tiered structure scales with inbox count:

Plan	Cost	Features
Starter	$49/month	1 inbox, AI warmup included
Business	$129/month	5 inboxes, basic analytics
Premium	$189/month	10 inboxes, detailed insights
Expert	$279/month	20 inboxes, limited API access

Note: No free trial. Annual discounts may apply; check current pricing.

Pros & cons of Warmy

Here’s what customers gain and where the tool falls short:

Pros	Cons
30+ language support	Expensive at scale
Strong customer support	Limited customization without a premium
Clean, visual interface	Gmail warmup issues reported
Real-time reputation tracking	Cost adds up for multiple inboxes
Automated engagement simulation	—

What users say about Warmy

G2 reviewers rate it 4.8/5 across 442+ reviews. Users love the automation and support but wish it cost less. Reddit consensus is that it “works fine for 1-2 Gmail inboxes, struggles with scale or Outlook.”

4. InboxAlly

InboxAlly positions itself as the premium solution for reputation repair and advanced warm-up. The platform trains mail servers to recognize your domain as engaging and legitimate through seed addresses that generate opens, clicks, replies, and folder movements.

One client used it to recover a domain flagged by Outlook after a disastrous campaign to purchase lists. Within three weeks, inbox rates jumped from 18% to 82%.

Key services offered by InboxAlly

InboxAlly provides comprehensive deliverability management:

• Email list hygiene and duplicate removal
• Multi-sender support with custom dashboards
• Live placement monitoring across Gmail, Outlook, Yahoo
• Automated warmup with customizable engagement profiles
• Reputation repair presets for damaged domains
• Real-time analytics and progress dashboards
• Strategy calls with deliverability experts

InboxAlly pricing

The premium positioning shows in pricing:

Plan	Cost	Features
Starter	$149/month	100 seed emails daily, 1 sender profile
Plus	$645/month	500 seed emails daily, 5 sender profiles
Premium	$1,190/month	Higher limits, priority support
Enterprise	Custom	Tailored for large operations

Pros & cons of InboxAlly

Here’s what customers gain and where the tool falls short:

Pros	Cons
Realistic engagement simulation	Expensive for small businesses
Multi-language support	Limited integrations
Intuitive dashboard	No API access
Excellent customer service	Basic reporting without upgrades
Measurable placement improvements	Results take 1-2 weeks

What users say about InboxAlly

Verified reviews across G2, Trustpilot, and Capterra average 4.8/5. A marketing manager: “We saw a significant bump in open rates and a decrease in spam complaints.” The pattern is that effectiveness justifies the cost if deliverability drives your revenue.

Testing & monitoring tools

Once the warmup builds sender reputation, you need to verify that emails are actually landing in the inbox. These tools reveal exactly where campaigns end up — inbox, promotions, spam — so you can fix problems before they cost you revenue.

1. Email Deliverability Test (by EmailWarmup.com)

This free tool solves a problem most platforms ignore: you need to know where your emails land before launching campaigns. Other tools charge $25-85 monthly for basic testing — this gives you unlimited tests forever.

The process takes 60 seconds. Choose your mode (email account or marketing system), copy seed addresses, send a test email, and get a detailed report showing placement across 50+ mailbox providers.

Key services offered by Email Deliverability Test

The tool provides comprehensive placement insights:

• Unlimited free deliverability testing
• Coverage across 50+ mailbox providers
• Works with Gmail, Outlook, iCloud, Mailchimp, SendGrid, and more
• Detailed reports showing inbox, spam, and promotions placement
• Email reply with full deliverability breakdown
• Regional and email client-specific results
• No credit limits or subscription fees

Email Deliverability Test pricing

Completely free, without any hidden charges, credit limits, or the need to subscribe. 

Pros & cons of Email Deliverability Test

Here’s what customers gain and where the tool falls short:

Pros	Cons
Unlimited free testing	Requires manual seed list copying
50+ provider coverage	No automated scheduling
Simple 60-second process	Reports via email (not dashboard)
Works with all ESPs	Basic reporting format
No signup required	—

What users say about Email Deliverability Test

Users switching from paid tools report saving $300- $ 1,000 annually. An e-commerce manager said the unlimited testing lets them “experiment with subject lines and content without worrying about credits.”

2. Email Spam Checker Chrome Extension (by EmailWarmup.com)

Forget logging into dashboards or running tests every time you need your deliverability rate. This email spam checker extension shows it right in your Gmail or Outlook compose window — free.

The color-coded meter shows green (inbox), yellow (promotions), or red (spam) as you write. Your sent folder shows estimated placement for each past email based on the tool’s testing infrastructure.

Key services offered by Email Spam Checker Extension

The extension provides live monitoring capabilities:

• Domain toxicity alerts
• Instant diagnosis of content warnings
• Real-time deliverability rate in the compose window
• Sent folder tags showing estimated inbox/promotions/spam placement
• Color-coded meter (green/yellow/red)
• Live engagement tracking

Email Spam Checker Extension pricing

Completely free, without any premium tiers or limitations.

Pros & cons of Email Spam Checker Extension

Here’s what customers gain and where the tool falls short:

Pros	Cons
Real-time deliverability visibility	Chrome-only (no Firefox/Safari)
Sent folder placement tracking	—
No dashboard login needed	—
Instant content warnings	—
Completely free	—

What users say about Email Spam Checker Extension

Users call it a valuable advantage for campaign optimization. An outreach specialist managing 15 client campaigns said it eliminated 90% of her testing workflow. One user noted that showing historical placement for every sent email without seed lists is extremely useful.

3. GlockApps

GlockApps operates as a comprehensive diagnostic hub for email health. 

The platform offers inbox placement testing, spam scoring, DMARC analysis, and blacklist monitoring — giving technical users the granular data needed to understand why emails miss the inbox.

A marketing manager scored it highly for helping them achieve strong open rates after properly setting up DKIM, DMARC, and SPF records.

Key services offered by GlockApps

The tool suite covers multiple deliverability functions:

• API access for automated testing
• Real-time alerts via Email, Slack, Telegram
• Authentication checks for SPF, DKIM, DMARC
• DMARC analyzer with automated report processing
• Spam scoring from Google, Barracuda, SpamAssassin
• Inbox placement testing across 20+ providers
• HTML code validation and content analysis
• Blacklist monitoring across 50+ sources

GlockApps pricing

Multiple pricing tiers based on usage:

Plan	Cost	Features
Free	$0	2 spam test credits, 1 sending account, 10K DMARC messages
Essential	$59/month	360 spam credits, IP monitoring
Growth	$99/month	1,080 spam credits, 10 accounts
Enterprise	$129/month	1,800 spam credits, 20 accounts
Credit Packs	$16.99–$75.99	Variable credits; annual billing saves 30%

Pros & cons of GlockApps

Here’s what customers gain and where the tool falls short:

Pros	Cons
Comprehensive diagnostic suite	Requires technical knowledge
Detailed actionable reports	Steep learning curve
API access for automation	Outdated interface
30+ blacklist coverage	No warm-up features
Integration with Postmaster Tools	—

What users say about GlockApps

G2 reviews average 4.8/5 across 37 ratings. Users appreciate the diagnostic depth but criticize the learning curve. The pattern: excellent for technical users who need detailed insights, but frustrating for beginners who want simple answers.

4. MxToolbox

MxToolbox specializes in technical diagnostics — DNS configurations, domain health, and blacklist management. 

It’s the tool IT admins and security professionals use when emails won’t deliver and they need to know exactly why.

The platform offers adaptive blacklist monitoring that analyzes every sending source, tracks reputation, and sends immediate alerts.

Key services offered by MxToolbox

MxToolbox focuses on infrastructure diagnostics:

• Domain Health Checker with DNS lookup
• Free weekly blacklist monitoring for one domain
• Authentication checks (SPF, DKIM, DMARC verification)
• Automatic sending source detection from DMARC reports
• Complaint monitoring and feedback loop tracking
• Adaptive blacklist monitoring across 100+ lists
• SMTP diagnostics and server testing

MxToolbox pricing

The pricing structure targets professionals:

Plan	Cost	Features
Free	$0	Limited weekly blacklist monitoring for 1 domain
Delivery Center	$129/month	Comprehensive monitoring
Delivery Center Plus	$399/month	Advanced features

Pros & cons of MxToolbox

Here’s what customers gain and where the tool falls short:

Pros	Cons
In-depth technical diagnostics	Outdated interface
100+ blacklist coverage	Steep learning curve
DMARC report integration	Doesn’t fix issues (only identifies)
Immediate alert system	Not beginner-friendly
Free tier available	—

What users say about MxToolbox

IT professionals praise it while marketers struggle with it. A Capterra reviewer: “Most of my messages are reaching corporate addresses now.” The complaints focus on usability for non-technical users.

5. Folderly

Folderly positions itself as the set-it-and-forget-it monitoring solution. 

The platform combines inbox placement testing, domain health monitoring, and automated warm-up in a package designed to “put your deliverability program on autopilot.”

A client managing cold outreach for 15 B2B clients uses Folderly’s Pulse feature (detects deliverability issues in real-time and sends alerts when emails hit junk). The real-time notifications via Slack saved them from a major campaign failure.

Key services offered by Folderly

Folderly provides active monitoring and warm-up:

• Technical issue guidelines and fixes
• Domain reputation and blacklist checks
• Spam trigger detection with built-in checker
• Daily automated warm-up with engagement simulation
• Inbox placement monitoring across Gmail, Outlook, Yahoo
• Two-week gradual volume increase algorithm
• Real-time spam alerts (email, Slack, SMS)
• SPF, DKIM, DMARC, BIMI verification

Folderly pricing

The pricing focuses on per-mailbox charges:

Plan	Cost	Features
Starting	$120/mailbox/month	Basic monitoring and warm-up
Inbox Insights	Add-on	Separate pricing available

Pros & cons of Folderly

Here’s what customers gain and where the tool falls short:

Pros	Cons
Automated deliverability management	Expensive (add-ons increase cost)
Real-time Slack/SMS alerts	Limited to major ISPs
AI-driven natural engagement	Inbox Insights not included in base
Easy warm-up setup	High cost for agencies
4.8/5 G2 rating	—

What users say about Folderly

Users rate it 4.8/5 on G2. An agency owner said, “Folderly handles everything automatically — we focus on campaigns.” The criticism centers on cost (especially with the Inbox Insights add-on). One reviewer noted testing is “limited to major ISPs,” which matters for international campaigns.

List validation & verification tools

Even a perfect sender reputation fails if your email list contains spam traps and invalid addresses. These tools clean your lists and verify contacts before you send, protecting your domain and improving deliverability.

1. Email Validation API (by EmailWarmup.com)

Most validation APIs stop at verification. This one validates your list AND includes warmup capabilities — combining two separate functions.

The API blocks disposables, spam traps, and typos before they enter your CRM. It’s positioned as a developer-focused API with custom pricing based on volume.

Key services offered by Email Validation API

The platform offers validation capabilities:

• SOC 2 Type II, GDPR-compliant
• Unlimited deliverability consultations
• REST/JSON API with SDKs in 8 languages
• Dedicated IP option for campaigns
• 100 free credits for testing

Email Validation API pricing

The API is free for up to 100 contacts per list per month. Custom pricing available for higher volumes.

Pros & cons of Email Validation API

Here’s what customers gain and where the tool falls short:

Pros	Cons
Developer-focused API	Custom pricing (not transparent)
SOC 2, GDPR compliant	Newer API (less documentation)
Unlimited consultations included	Requires developer setup
Integration with multiple tools	Learning curve for advanced features

What users say about Email Validation API

Early adopters report positive results with the API integration. The dual-function approach gets praise for consolidating separate tools.

2. ZeroBounce

ZeroBounce operates as an all-in-one validation toolkit with 99.6% guaranteed accuracy. 

The platform identifies 30+ email types (including spam traps, abuse accounts, and disposable addresses) and appends social data, such as names and gender, for better targeting.

A digital marketing manager on Capterra used it for 2 years and called it “reliable and effective,” noting that its accuracy and quality “justify the cost for businesses prioritizing email marketing success.”

Key services offered by ZeroBounce

The comprehensive feature set includes:

• Activity data appending
• AI-powered email scoring
• DMARC monitor for authentication
• Blacklist monitoring (24-hour scans)
• Integration with major ESPs and CRMs
• Inbox placement testing (20+ providers)
• Spam trap and abuse email detection
• Bulk and real-time email verification
• Email finder for lead generation
• Email server diagnostics

ZeroBounce pricing

Credit-based model with flexible options:

Plan	Cost	Features
Free	$0	100 monthly validation credits
Pay-As-You-Go	Starting $16	2,000 credits
Monthly	Starting $18/month	2,000 credits
Enterprise	Custom	1M+ emails/month

Credits work across validation, scoring, and email finder.

Pros & cons of ZeroBounce

Here’s what customers gain and where the tool falls short:

Pros	Cons
99.6% accuracy guarantee	Credit-based pricing adds up
30+ email type detection	Domain-level catch-all only
Activity data appending	Results expire after 30 days
24/7 live chat support	More expensive than competitors
Comprehensive toolkit	Subscription confusion reported

What users say about ZeroBounce

G2 rating: 4.6/5 from 491 reviews. 

Users appreciate accuracy but complain about pricing. One Capterra reviewer said that it “prevented me from being sanctioned for sending to inactive addresses.” Another criticized the unexpected auto-renewal. 

The verdict is… ZeroBounce pays for itself if you value accuracy, but watch the auto-renewal settings.

3. Clearout

Clearout uses AI-powered verification, performing 20+ real-time checks for 99% accuracy. The platform emphasizes speed and offers unique features like gibberish detection and advanced catch-all resolution.

A reviewer on G2 noted that Clearout “identified about 10% invalid contacts in our database” and praised the “best price and easiest to use” among validation tools.

Key services offered by Clearout

Clearout provides focused validation capabilities:

• Bulk and API verification
• Gibberish email detection
• Advanced catch-all domain resolver
• WordPress plugin for instant validation
• AI-powered email verification (20+ checks)
• Email finder with confidence scoring
• On-form real-time verification
• Phone number validation

Clearout pricing

Pay-as-you-go model with scaling discounts:

Plan	Cost	Features
Starting	$14/month (annual)	3,000 credits
Scaling	Volume-based	Decreasing per-credit cost
Minimum	$3.50	500 credits

Credits never expire. No monthly commitments.

Pros & cons of Clearout

Here’s what customers gain and where the tool falls short:

Pros	Cons
99% accuracy guarantee	Credit-based limits frequently used
Fast processing speed	Domain-level catch-all detection
Gibberish detection unique	Performance slows on large lists (10K+)
No credit expiration	No unlimited usage model
Easy integration	Premium features require volume

What users say about Clearout

Users rate it highly for accuracy and price. A marketer on Capterra claimed that “It works amazingly well at validating… best price and easiest to use.” The criticism focuses on speed degradation with large lists.

4. Bouncer

Bouncer distinguishes itself with 99.5% verification accuracy and a unique toxicity-detection feature that assigns risk scores to addresses based on spam-trap associations, complainers, and risky behavior.

The platform verifies email addresses using AI and direct SMTP checks, supporting bulk lists up to 250K emails. A founder on Capterra praised the “credit top-up system as cool and fair” with an excellent “price-to-benefit ratio.”

Key services offered by Bouncer

Bouncer focuses on accuracy and risk detection:

• Blocklist monitoring
• Inbox placement testing
• Bulk and real-time verification
• GDPR and SOC2 compliant (EU hosting)
• Authentication checks (SPF, DKIM, DMARC)
• 99.5% accuracy rate with AI + SMTP checks
• Syntax and disposable email verification
• Toxicity detection and risk scoring
• API for instant verification
• Google Sheets add-on

Bouncer pricing

Competitive pay-as-you-go structure:

Plan	Cost	Features
Minimum	$8	1,000 credits ($0.008/verification)
Volume	$20	5,000 credits ($0.004/verification)
Scaling	Up to $1,600	1M credits
Monthly	From $6/month	1,000 credits

Credits never expire.

Pros & cons of Bouncer

Here’s what customers gain and where the tool falls short:

Pros	Cons
99.5% verification accuracy	Email support only (24-hour wait)
Toxicity detection unique	Limited inbox placement insights
GDPR/SOC2 compliant	No live chat/phone support
Competitive pricing	Fewer integrations than ZeroBounce
G2 rating: 5.0/5	—

What users say about Bouncer

G2 reviews show a 5.0/5 rating. Users praise accuracy and simplicity. A Capterra reviewer suggested that it “easily cleans my lists to reduce bounces and ensure best contacts.” The main complaint is slow email support compared to competitors offering live chat.

How to choose the best email deliverability tool

Pick based on what’s actually broken:

• Emails going to spam → Use testing first
• Managing multiple clients → Prioritize unlimited accounts
• Need email reputation repair → Invest in advanced engagement
• Sending from new domains → Start with warmup
• High email bounce rate → Validate your list

Budget matters, but cheap tools cost more when they don’t work. A $19/month tool that hits 98% inbox rates can deliver better ROI than a free tool with lower placement rates.

Most importantly, always test before you commit. Every tool here offers a trial or a free plan. Use them.

Frequently asked questions about email deliverability tools

Here are some commonly asked questions about email deliverability tools: