Best software · Marketing
9 Best Email Deliverability Tools of 2026
This list is for marketers, founders and sales teams whose emails are landing in spam or who are about to send from a new domain. It covers three kinds of tools: inbox placement and spam testers, mailbox warmup services and authentication monitors for SPF, DKIM and DMARC.
By the Mojolin research desk · Updated November 2, 2026 · 9 tools compared · Prices checked on vendor pages, latest November 3, 2026
Questions or corrections: editorial@mojolin.com
Mojolin is self-funded How we score
GlockApps is our top pick because it combines inbox placement tests, DMARC analytics and reputation monitoring, with a free plan and paid plans from $59 per month billed yearly. Cold email senders who need warmup should start with MailReach or lemwarm, and anyone who just needs to find a broken DNS record can do it for free with mailX or MailGenius.
Top picks
Best overall
GlockApps
8.5 / 10
Marketing teams and agencies that want placement testing and DMARC reporting in one account.
Read the review →Runner-up
MailReach
8.4 / 10
Cold email teams warming several mailboxes at a predictable per-mailbox cost.
Read the review →Also great
MailGenius
8.3 / 10
Marketers and founders who want a quick, plain-English spam check.
Read the review →Comparison table
| # | Tool | Pricing | Score | |
|---|---|---|---|---|
| 1 | GlockApps | Marketing teams and agencies that want placement testing and DMARC reporting in one account. | Free plan; Essential $59, Growth $99 and Enterprise $129 per month billed yearly | 8.5 |
| 2 | MailReach | Cold email teams warming several mailboxes at a predictable per-mailbox cost. | Warmup from $19.50 per mailbox per month, with at least 20 spam test credits included | 8.4 |
| 3 | MailGenius | Marketers and founders who want a quick, plain-English spam check. | Free basic spam test; paid plans from $23 per month for 60 tests, $39 per month for unlimited tests | 8.3 |
| 4 |  EasyDMARC | Businesses that need to set up and maintain DMARC across their sending domains. | DMARC Plus from $35.99 per month billed yearly ($44.99 monthly); DMARC Premium from $71.99 per month billed yearly | 8.1 |
| 5 |  lemwarm | Solo senders and lemlist users who want affordable warmup. | Essential $24 per mailbox per month billed yearly ($29 monthly); Smart $40 per mailbox per month billed yearly; included with every lemlist plan | 8.1 |
| 6 |  Warmy | Teams that want warmup, placement tests and reputation data in one platform. | Plans from $49 per month; 7-day trial | 8.1 |
| 7 |  mailX | Anyone who needs a free, no-signup check of their email DNS records. | Free, no account required | 7.9 |
| 8 |  MxToolbox Delivery Center | IT teams and higher-volume senders that want monitoring across several domains. | Free plan with weekly blacklist monitoring for 1 domain; Delivery Center $129 per month; Delivery Center Plus $399 per month | 7.8 |
| 9 |  Mailwarm | Teams that want warmup plus hands-on expert help with inbox placement. | Starter $79 per month ($69 billed yearly) for 1 mailbox; Growth $189 for 3 mailboxes; Scale $549 for 10 mailboxes | 7.6 |
Scoring weights
Every tool gets three editorial scores out of 10, from vendor documentation, product pages and the published price. The overall score is the weighted average below, the same method on every list. Full method
The full ranking
Rank 1 · Best overall
GlockApps
A deliverability suite with inbox placement tests, DMARC analytics, uptime and IP reputation monitoring.
glockapps.com8.5
out of 10
Best for: Marketing teams and agencies that want placement testing and DMARC reporting in one account.
GlockApps is the most complete deliverability toolkit on this list for senders who already have their mailboxes set up. Inbox Insight sends your message to seed addresses and reports where it lands, DMARC Analytics parses your authentication reports, and uptime and IP reputation monitors alert you to problems before a campaign goes out. Every plan includes unlimited DMARC domains, and higher tiers raise the number of test credits, monitors and message volume.
The free plan is useful for a first look, though it only includes two spam test credits, and paid plans start at $59 per month on yearly billing. GlockApps does not warm up mailboxes, so cold email teams will pair it with a warmup tool. For marketing teams and agencies that need to prove deliverability across several clients, it is the strongest all-round choice.
Standout feature
It pairs inbox placement tests with DMARC analytics and unlimited DMARC domains on every plan.
Use cases
Email marketers
Test a newsletter's inbox placement before sending
Outcome: Problems fixed before the send
Agencies
Monitor DMARC reports for many client domains
Outcome: Spoofing and setup errors spotted early
Key features
- Inbox Insight spam and placement tests
- DMARC Analytics with unlimited DMARC domains on every plan
- Uptime monitors and IP reputation monitors
- Google Postmaster tool access
- Free checkers for SPF, DKIM, DMARC, MX and BIMI
Pros
- Covers testing, authentication and monitoring in one product
- Free plan to try placement tests
- Credit packs available if you only test occasionally
Cons
- Free plan includes only 2 spam test credits
- Dashboard has a learning curve for non-technical users
Rank 2 · Runner-up
MailReach
An email warmup service with spam tests and domain health checks, priced per mailbox.
mailreach.co8.4
out of 10
Best for: Cold email teams warming several mailboxes at a predictable per-mailbox cost.
MailReach is a focused warmup service for teams that send cold email. You connect each mailbox and MailReach runs automated warmup across Google, Outlook and other providers, sending up to 100 emails a day, while a dashboard tracks reputation and checks blacklists, SPF, DKIM and DMARC. Every warmup plan also includes at least 20 spam test credits, so you can confirm placement without buying a separate tester.
Pricing is simple: $19.50 per mailbox per month, with discounts for annual billing and a custom quote above 100 mailboxes. That makes MailReach cheaper than Mailwarm for the same number of inboxes, though you do not get a dedicated expert. It is a good fit for outbound teams that want warmup and testing without a larger platform.
Standout feature
Every warmup plan includes at least 20 spam test credits at no extra cost.
Use cases
SDR teams
Warm up new sending domains before a campaign
Outcome: Higher inbox placement from day one
Lead generation agencies
Track reputation across many client mailboxes
Outcome: Problem inboxes caught early
Key features
- Fully automated warmup with a smart AI warming algorithm
- Warmup across multiple providers such as Google and Outlook
- Spam test credits included with every warmup plan
- Reputation tracking dashboard
- Domain and inbox health checks for blacklists, SPF, DKIM and DMARC
Pros
- Clear per-mailbox pricing
- Spam testing bundled with warmup
- Works with Google, Outlook and other providers
Cons
- Costs scale directly with the number of mailboxes
- Focused on outbound senders rather than newsletters
Rank 3 · Also great
MailGenius
A free spam test that grades an email and explains authentication, content and blacklist issues.
mailgenius.com8.3
out of 10
Best for: Marketers and founders who want a quick, plain-English spam check.
MailGenius is the fastest way to find out why one email is going to spam. You send a message to a test address and get a report with a final score, authentication results, spam trigger flags and tips to fix each problem, and the basic version is free. Paid plans add an AI deliverability consultant, AI copywriting analysis, inbox placement results and, on the top tier, automatic testing of every email you send plus blacklist monitoring for unlimited domains.
At $23 to $79 per month, it is cheaper than the larger suites, and the reports are easier for non-technical marketers to act on. It does not warm mailboxes or parse DMARC reports at scale, so treat it as a diagnostic tool rather than a full platform.
Standout feature
The free spam test gives a scored report with plain-English fixes in a couple of minutes.
Use cases
Founders
Check a cold email draft for spam triggers
Outcome: A cleaner first send
Email marketers
Test templates after an ESP change
Outcome: Authentication confirmed
Key features
- Free spam test with a final score and fix-it tips
- SPF, DKIM, DMARC, BIMI and blacklist checkers
- AI deliverability consultant and copywriting rewrite on paid plans
- Inbox placement included in paid test results
- Automatic testing of every sent email and unlimited domain blacklist monitoring on the top plan
Pros
- Free test with no setup
- Reports explain issues in plain language
- Low-cost paid plans
Cons
- No warmup
- Placement data and monitoring only on paid plans
Rank 4
EasyDMARC
A DMARC platform that monitors SPF, DKIM and DMARC and helps you move domains to enforcement.
easydmarc.com8.1
out of 10
Best for: Businesses that need to set up and maintain DMARC across their sending domains.
EasyDMARC is the pick for authentication. Since Google, Yahoo and Microsoft began enforcing sender requirements, many businesses need a working DMARC policy, and EasyDMARC turns the raw XML reports into readable dashboards so you can see who sends as your domain and move safely to enforcement. DMARC Plus covers 100,000 emails a month across two domains with three months of history, and Premium adds four domains, a year of history, EasySPF, proactive alerts and AI agents.
It does not test inbox placement or warm mailboxes, so it complements a tool like GlockApps or MailReach rather than replacing it. The free record checkers and generators are good enough for a one-off setup, and the paid plans are fairly priced for ongoing monitoring.
Standout feature
It makes DMARC reports readable and guides domains to enforcement with alerts and SPF tooling.
Use cases
Small businesses
Publish a DMARC record and track who sends as their domain
Outcome: Compliance with mailbox provider rules
IT teams
Move domains from monitoring to enforcement
Outcome: Less spoofing of company email
Key features
- DMARC monitoring and reporting
- EasySPF and proactive DMARC alerts on Premium
- AI agents for DMARC management on Premium
- 36+ integrations
- Free DMARC and SPF record checkers and generators
Pros
- Free trial with no credit card
- Clear volume and domain limits per plan
- Strong free tools for record checks
Cons
- Focused on authentication rather than inbox placement
- Plus covers only 2 domains and 3 months of history
Rank 5
lemwarm
An email warmup tool from lemlist with human-like warmup emails and deliverability reports.
lemwarm.com8.1
out of 10
Best for: Solo senders and lemlist users who want affordable warmup.
lemwarm is the warmup engine behind lemlist, sold on its own for senders who use other outreach tools. Essential warms one mailbox with human-like emails across a network of 20,000+ domains and adds a technical setup check and deliverability reports. Smart, the plan most teams will want, warms with your real templates and adds custom alerts and a network tailored to your industry.
The pricing is per mailbox, at $24 on yearly billing for Essential and $40 for Smart. If you already pay for lemlist, you get lemwarm included, which makes it the obvious choice. For everyone else, MailReach bundles spam testing for less, while lemwarm wins on ease of setup.
Standout feature
It is included with every lemlist plan, so lemlist users pay nothing extra for warmup.
Use cases
Founders doing outreach
Warm a new Google Workspace mailbox
Outcome: First campaigns reach the inbox
lemlist customers
Keep sending mailboxes warm at no extra cost
Outcome: Stable sender reputation
Key features
- Automatic email warmup
- Technical setup check and deliverability reports
- Warmup network of 20k+ domains
- Personalized warmup emails using your real templates on Smart
- Custom deliverability alerts and industry-tailored network on Smart
Pros
- Included free with any lemlist plan
- Simple setup for one mailbox
- Smart plan warms with your real templates
Cons
- No inbox placement testing beyond reports
- Per-mailbox price adds up for large teams
Rank 6
Warmy
A warmup and deliverability platform with AI guidance, placement tests and a large mailbox network.
warmy.io8.1
out of 10
Best for: Teams that want warmup, placement tests and reputation data in one platform.
Warmy goes further than basic warmup. Plans include placement test credits shared across mailboxes, domain and IP reputation tracking, Google Postmaster data, DMARC monitoring and email verification, with an AI co-pilot called Adeline that explains reports and suggests what to check next. Warmup runs through a network that Warmy says has over a million mailboxes.
Plans start at $49 per month with a 7-day trial. The pricing page asks you to confirm some allowances, such as monthly test credits, with the Warmy team, so it is less transparent than MailReach or lemwarm. If you want one deliverability platform rather than separate warmup and testing tools, it is worth a trial.
Standout feature
Email verification and DMARC monitoring come in the same plan as warmup.
Use cases
Outbound teams
Warm mailboxes and verify lists before sending
Outcome: Fewer bounces and spam hits
RevOps
Pull deliverability data into internal tools by API
Outcome: Deliverability in team dashboards
Key features
- Warmup through a network of over 1 million mailboxes
- Shared placement test credits across mailboxes
- Domain and IP reputation tracking with Google Postmaster data
- DMARC monitoring and email verification
- Adeline AI co-pilot, API access and MCP options
Pros
- Warmup, testing and monitoring in one place
- Email verification included
- Full API access for automation
Cons
- Test allowances depend on the plan and are confirmed with the vendor
- Higher entry price than single-purpose warmup tools
Rank 7
mailX
A free email DNS and deliverability toolkit for SPF, DKIM, DMARC, BIMI, MX and blacklist checks.
themailx.com7.9
out of 10
Best for: Anyone who needs a free, no-signup check of their email DNS records.
mailX is a free toolkit for the first step in any deliverability fix: checking your DNS. Enter a domain and it runs a live scan of SPF, DKIM, DMARC, BIMI, MX and blacklist status, then explains each issue in plain English with a fix. It also includes SMTP and IMAP tests, DNS lookups and SPF and DMARC record generators.
It is built for AI assistants as well as people, with an API, an MCP server you can add to Claude and a ChatGPT integration. What it does not do is warm mailboxes, test inbox placement or monitor a domain over time, so it complements rather than replaces the paid tools here. As a free first check, it is hard to beat.
Standout feature
Every check is free with no signup, and it can be used directly from AI assistants through MCP.
Use cases
Small business owners
Find out why invoices land in spam
Outcome: A missing DNS record identified
Developers
Check DNS from an AI coding assistant through MCP
Outcome: Fixes without leaving the editor
Key features
- One-scan domain check of SPF, DKIM, DMARC, BIMI, MX and blacklists
- SMTP and IMAP tests and finders
- SPF and DMARC record generators
- Plain-English explanations and fixes
- API, MCP server and a ChatGPT integration
Pros
- Completely free with no account
- Runs against live DNS in real time
- Works from AI assistants through MCP
Cons
- No warmup or inbox placement testing
- No ongoing monitoring or alerts
Rank 8
MxToolbox Delivery Center
Email delivery monitoring with inbox placement, DMARC reports, blacklist and mail flow monitoring.
mxtoolbox.com7.8
out of 10
Best for: IT teams and higher-volume senders that want monitoring across several domains.
MxToolbox is known for its free DNS and blacklist lookups, and Delivery Center is its paid deliverability product. The $129 plan covers five domains and 500,000 messages, with 30 inbox placement analyses a month, complaint reporting, DMARC performance reports, adaptive blacklist monitoring, mail flow monitoring, BIMI management and domain impersonation protection. Placement reports also check Google, Microsoft and Yahoo bulk sender requirements.
It is built for the people who own email infrastructure, such as IT admins and operations teams at higher-volume senders, and it shows in the interface. Small senders can stay on the free tier, which runs weekly blacklist checks for one domain, and use a simpler tester when they need a placement check.
Standout feature
It adds inbound and outbound mail flow monitoring to deliverability reporting, which most testers skip.
Use cases
IT administrators
Monitor mail flow and blacklists for company domains
Outcome: Outages and listings found quickly
High-volume senders
Check compliance with bulk sender rules
Outcome: Fewer blocked campaigns
Key features
- Inbox placement analysis, 30 per month on Delivery Center
- Recipient complaint reporting from Google Postmaster and feedback loops
- DMARC email delivery performance reports
- Adaptive sender blacklist monitoring
- Inbound and outbound mail flow monitoring and BIMI management
Pros
- Free tier for blacklist monitoring
- Broad monitoring for IT and email admins
- Checks Google, Microsoft and Yahoo bulk sender requirements
Cons
- Paid plans start at $129 per month
- Interface is aimed at technical users
Rank 9
Mailwarm
A managed email warmup service with a deliverability expert included on every plan.
mailwarm.com7.6
out of 10
Best for: Teams that want warmup plus hands-on expert help with inbox placement.
Mailwarm positions itself as warmup with a person behind it. Every plan includes calls with a deliverability expert, and the warmup itself generates engagement such as opens and not-spam marks across 50,000+ aged inboxes, with provider-level control over Gmail, Outlook, Microsoft 365, Yahoo and SMTP. It also tracks spam score and inbox placement and deactivates invalid inboxes automatically to protect your reputation.
That service costs more than self-serve tools: $79 a month for one mailbox, or $69 on yearly billing, and there is no free trial. For a team running a single important domain that has already hit trouble, the expert time can justify the price. For many mailboxes on a budget, MailReach or lemwarm cost far less.
Standout feature
Every plan includes calls with a deliverability expert, not just a warmup dashboard.
Use cases
Founders with a burned domain
Rebuild sender reputation with expert help
Outcome: A recovery plan, not just a dashboard
Newsletter creators
Warm a new sending domain before launch
Outcome: Early issues avoided
Key features
- Engagement from 50,000+ aged real inboxes
- Deliverability expert guidance on every plan
- Spam score and inbox placement insights
- Provider-level warmup for Gmail, Outlook, Microsoft 365, Yahoo and SMTP
- Automatic deactivation of invalid inboxes to reduce bounces
Pros
- Human expert support included
- Choose which providers to warm against
- Free deliverability audit and spam checker
Cons
- Most expensive per mailbox on this list
- No free trial
Frequently asked questions
+What is an email deliverability tool?
It is software that helps your emails reach the inbox instead of spam. Tools on this list do one or more of three jobs: test where a message lands, warm up new mailboxes so providers trust them, and monitor authentication records such as SPF, DKIM and DMARC.
+Do I need email warmup?
Warmup matters most for new domains and mailboxes used for cold outreach. MailReach, lemwarm, Warmy and Mailwarm all warm mailboxes. If you send newsletters through an established ESP, placement testing and DMARC monitoring are usually more useful.
+Is there a free email deliverability checker?
Yes. mailX is free with no account, MailGenius offers a free basic spam test, GlockApps has a free plan with a small number of test credits, and MxToolbox has a free tier with weekly blacklist checks for one domain.
+How much do deliverability tools cost?
Warmup typically costs $19.50 to $79 per mailbox per month on this list. Testing and monitoring suites start at $23 per month for MailGenius, $35.99 for EasyDMARC billed yearly and $59 for GlockApps billed yearly, rising to $129 or more for MxToolbox Delivery Center.
+Why are my emails going to spam?
The most common causes are missing or broken SPF, DKIM or DMARC records, a domain or IP on a blacklist, a new mailbox with no sending history, and spammy content or links. Start with a free DNS check, then run a placement test to see where messages land.
+How did you score these tools?
Scores are editorial assessments based on documented features, published pricing and vendor documentation, weighted 40% features, 30% ease of use and 30% value. We did not run hands-on tests, and prices were checked on each vendor's pricing page from a US location on November 2, 2026.
About this list
Updated November 2, 2026 by the Mojolin research desk. Mojolin is self-funded
Questions or corrections: editorial@mojolin.com
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