MailGenius
A free spam checker that grew into automatic pre-send testing and blacklist watching
MailGenius is an email deliverability testing tool that scores a message against spam filters, checks SPF, DKIM, and DMARC authentication, flags blacklist listings and broken links, and on its paid tiers tests every outgoing message automatically and monitors domains for blocklist entries; it is a placement and spam testing product and does not warm mailboxes or ingest DMARC aggregate reports.
Overview
MailGenius does the second job in this category: placement and spam testing. You send a message to an address it gives you, and it comes back with a score, the authentication results, the content and HTML problems, the blacklist status of the sending domain and IP, and a list of the specific things a filter is likely to object to. It is a pre-send diagnostic, not a reputation builder and not an authentication monitor.
It reached a lot of senders as a free tool. For years the free test required no account at all, which made it one of the default answers when someone asked why their email was going to spam, and the vendor states the free checker draws hundreds of new users a day. That free entry point is still there, and for a sender running one campaign a month it may be all that is needed.
The paid product is where the positioning has changed. Beginner at $23 a month covers sixty tests, Genius at $39 covers unlimited tests plus the ability to test competitors' and prospects' emails, and the top plan at $79 adds automatic testing of every outgoing message and blacklist monitoring across unlimited domains, with twenty percent off for annual billing. That $79 plan is the interesting one, because automatic testing changes the tool from something you remember to use into something that watches continuously, which is the difference between catching a template problem before a send and discovering it from a customer complaint.
The ownership shapes the product. Troy Ericson, who also runs EmailDeliverability.com and emailMarketing.com, acquired MailGenius at the end of 2022 from owners who had stopped investing in it, spent 2023 repairing it, and relaunched it in October 2023. That means the tool is now the software arm of a deliverability consultancy, which explains the AI copywriting analysis sitting alongside the technical checks and the consulting upsell throughout the product. Buyers should read that as both a strength, since the people behind it do this work daily, and a caution, since the software is not the whole business.
Best for
Email marketers, copywriters, and small outbound teams who want a fast pre-send spam diagnostic with plain-language reasons, plus continuous automatic testing and blacklist alerting on the top plan.
Not the right fit for
- Anyone whose real problem is a cold or unwarmed sending domain; MailGenius will diagnose the resulting spam placement accurately and cannot do anything to change it, because reputation building is a warming tool's job.
- Teams that need DMARC aggregate report monitoring; MailGenius checks authentication on a per-message basis and does not ingest reports or tell you who else is sending as your domain.
- Buyers who need documented seed panel composition and provider-by-provider placement statistics; MailGenius reports simulated filter behaviour and a score rather than a published seed list result set.
- Cold outbound operators running dozens of mailboxes who need per-mailbox reputation management; the model here is per-message testing, not per-identity monitoring.
- Enterprises expecting SSO, audit logs, or a procurement-grade vendor relationship; this is a small, owner-operated product attached to a consultancy.
How it works
- 1
You request a test and MailGenius generates a unique address. You send your real message to it from the platform you actually send from, so the test reflects your genuine sending infrastructure, headers, and authentication rather than a simulated send.
- 2
The tool inspects the arriving message and reports a deliverability score alongside itemized findings: SPF, DKIM, and DMARC authentication results, blacklist presence for the sending domain and IP, broken links, HTML and content problems, and subject line issues that push filter scores upward.
- 3
The AI layer analyses the copy itself, flagging phrasing likely to trip content filters and offering rewrites, which reflects the consultancy origins of the current owner and is unusual in an otherwise technical tool.
- 4
On the top plan, testing becomes automatic: every outgoing message from configured senders is tested rather than only the ones you remember to check, and blacklist monitoring runs continuously across unlimited domains with alerts when a listing appears.
Feature breakdown
20 features in 4 modulesSpam and deliverability testing
The core diagnostic, and the part that has been free for years.- Deliverability score with itemized findings
- Returns a score alongside the specific reasons behind it, so the output is a fix list rather than an opaque number.
- Authentication checking
- Verifies SPF, DKIM, and DMARC results for the tested message. This is a per-message check and not a substitute for DMARC report monitoring across your domain.
- Filter behaviour across major providers
- Assesses how the message is likely to be treated by Gmail, Outlook, and Yahoo filtering rather than reporting only a generic spam score.
- Blacklist checking
- Checks the sending domain and IP against blocklists, one of the few structural causes of filtering a sender can act on the same day.
- Broken link detection
- Flags dead or malformed links, which both harm engagement and raise filter suspicion when they point at low-reputation domains.
- Free test without an account
- The basic spam test has long been available free with no signup, which is why the tool is so widely known among people who do not otherwise buy deliverability software.
Content and copy analysis
The consultancy influence: filters read words, not just headers.- AI copywriting analysis
- Reviews the message copy for phrasing likely to trip content filters, included on every paid tier.
- AI rewrite suggestions
- Proposes alternative wording rather than only flagging problems, which is a meaningful difference for a marketer without a deliverability background.
- Subject line assessment
- Evaluates the subject line specifically, since it is both the highest-leverage engagement element and a common filter trigger.
- AI deliverability consultant
- An in-product assistant that explains findings in context, included on all paid plans and reflecting the vendor's consulting practice.
- Official deliverability guide
- Bundled written material from the owner's consultancy, included with every paid plan.
Continuous testing and monitoring
The top plan, where the tool stops waiting to be remembered.- Automatic testing of outgoing mail
- Every outgoing message from configured senders is tested rather than only the ones you think to check, which is the single feature that justifies the $79 tier.
- Blacklist monitoring across unlimited domains
- Continuous blocklist watching with alerts, unrestricted by domain count on the top plan.
- Competitor and prospect testing
- From the Genius tier, you can test emails you receive from others, which is how agencies audit a prospect's deliverability before a pitch.
- Unrestricted sending sources
- The top plan removes restrictions on which addresses and domains you can test from, which matters for agencies working across client infrastructure.
Plans and access
Three published tiers plus a free entry point.- Free spam test
- Basic testing with no account required, the acquisition channel that made the product widely known.
- Test volume tiers
- Sixty tests a month on Beginner at $23, unlimited tests on Genius at $39 and on the $79 monitoring plan.
- Annual discount
- Twenty percent off when billed yearly rather than monthly, across all paid tiers.
- Self-serve signup
- Accounts are created directly after purchase without a sales conversation, though the vendor also sells hands-on consulting alongside the software.
- Consulting attachment
- The owner runs a deliverability consultancy, so the product includes a clear upgrade path to human help, which is genuinely useful and also a persistent upsell.
Use cases
4 documentedCopywriter whose client campaign started hitting spam
A promotional sequence that used to perform is now filtered, and the client suspects the copy but has no way to check.
A test isolates two content triggers and a broken tracking link, the AI rewrite proposes safer phrasing, and a retest confirms the score recovered before the next send.
Small team wanting testing without discipline
Everyone agrees pre-send testing matters and nobody actually remembers to do it, so problems are discovered from reply volume instead.
The $79 plan tests every outgoing message automatically, turning testing from a habit into infrastructure, with blacklist alerts covering the domains as well.
Agency auditing a prospect before a pitch
The agency wants to open a conversation with evidence that the prospect's email programme has deliverability problems.
The Genius tier's competitor and prospect testing lets the agency test a message received from the prospect and lead the pitch with specific findings.
Founder checking a new transactional template
A new password reset template needs to be checked before it goes live to every user, and there is no budget for a deliverability platform.
The free test, with no account required, catches an unsigned DKIM header and a link shortener that filters dislike, at no cost.
Pricing
from $0 (free spam test), then $23 per month (Beginner)Freemium, with a free no-account spam test and three published monthly subscription tiers separated by test volume and monitoring capability.
| Plan | Price | Includes |
|---|---|---|
| Free spam test | $0 per test |
The reason most people have heard of MailGenius, and enough for an occasional sender. |
| Beginner | $23 per month |
|
| Genius | $39 per month |
The tier most active senders should be on; unlimited testing removes the incentive to ration checks. |
| Automatic Testing and Domain Monitoring | $79 per month |
The only tier that monitors continuously rather than waiting for you to run a test. |
Billing notes
- Annual billing takes twenty percent off the monthly rate across all paid plans.
- The free no-account test remains available and is a genuine product rather than a limited trial, which sets a low floor on what anyone needs to spend.
- Test volume is the axis on the lower tiers and monitoring capability is the axis at the top; the jump from $39 to $79 buys automation, not more tests.
- Blacklist monitoring on the top plan is unrestricted by domain count, which is unusually generous compared with per-domain monitoring pricing elsewhere in the category.
- The vendor also sells hands-on deliverability consulting, priced separately, and the product surfaces that path frequently.
Value assessment: At $39 for unlimited testing with AI copy analysis, MailGenius is fairly priced against the specialist placement platforms, and the free test undercuts the entire category for occasional use. The $79 tier is where the value judgement gets interesting: automatic testing of every outgoing message and unlimited-domain blacklist monitoring is genuinely a different product from an on-demand checker, and no other tool at this price watches continuously in that way. What you are not buying is a documented seed panel with provider-by-provider placement statistics, which is what GlockApps sells, or rendering testing, which is what Unspam bundles. Buy MailGenius for the diagnostic and the copy layer; buy elsewhere if you need publishable placement evidence.
Strengths & limitations
Strengths
- A genuinely free, no-account spam test that has been the entry point for a large number of senders and is still a complete diagnostic for occasional use.
- Itemized findings with plain-language reasons rather than an opaque score, which makes the output actionable for a marketer.
- AI copy analysis and rewriting sits alongside the technical checks, which is unusual and reflects the fact that filters read content as well as headers.
- Automatic testing of every outgoing message on the top plan turns testing from a discipline into infrastructure.
- Blacklist monitoring across unlimited domains on the top tier, where most competitors price monitoring per domain.
- Run by a working deliverability consultancy, so the advice embedded in the product comes from people doing this daily.
- Competitor and prospect testing from the Genius tier is a real agency workflow that most testing tools do not support.
Limitations
- No documented seed panel composition or provider-by-provider placement statistics, so it produces a diagnosis rather than publishable placement evidence.
- No DMARC aggregate report ingestion, so it cannot tell you who else sends as your domain or drive a p=reject deployment.
- No warming or reputation building at all, so a cold sending domain will keep failing tests no matter how many you run.
- No rendering or dark mode preview testing, which Unspam bundles at a lower price.
- The consulting upsell is prominent throughout the product, which some buyers will find useful and others will find intrusive.
- Small, owner-operated vendor with no disclosed headcount or funding, and a period of neglect under previous owners before the 2023 relaunch.
- Per-message testing does not scale to monitoring many sending identities, so cold outbound operators running dozens of mailboxes need a different shape of tool.
Head-to-head comparisons
5 alternativesMailGenius vs Unspam
from $0 (Free), then $9 per month (Basic)Both are cheap pre-send testers. Unspam is cheaper, adds cross-client rendering in light and dark mode plus heatmaps, and has a usable free tier with monthly allowances. MailGenius counters with AI copy rewriting and, on its $79 plan, automatic testing of every outgoing message and unlimited-domain blacklist monitoring. Take Unspam for placement plus design QA on a budget; take MailGenius for continuous automatic testing and copy-level help.
Full MailGenius vs Unspam comparisonMailGenius vs GlockApps
from $59/mo (Essential, billed annually)GlockApps is the more rigorous placement instrument, with a documented seed panel of seventy-plus addresses, multi-filter scoring, DMARC analytics, and scheduled monitoring. MailGenius produces a faster, more readable diagnosis with copy analysis attached. Choose GlockApps when you need defensible provider-by-provider placement data; choose MailGenius when you need to know what to change and want the copy layer covered too.
Full MailGenius vs GlockApps comparisonMailGenius vs MailReach
from $25/mailbox/moMailReach warms mailboxes through a network of real inboxes and runs placement tests, so it can fix reputation as well as measure it. MailGenius only measures. If your outbound mailboxes are landing in spam because they are new or damaged, MailReach addresses the cause; MailGenius will keep describing the symptom accurately.
Full MailGenius vs MailReach comparisonMailGenius vs EasyDMARC
from $0 (Free, one domain), then $35.99 per month billed annually (Plus)These are frequently confused and answer different questions. EasyDMARC monitors DMARC aggregate reports across a domain to reveal every sender using it and to drive a policy to p=reject. MailGenius tests whether an individual message is likely to be filtered. Authentication problems belong to EasyDMARC; content and reputation symptoms belong to MailGenius. Many senders eventually need both.
Full MailGenius vs EasyDMARC comparisonMailGenius vs Folderly
from $96/mailbox/moFolderly is a managed deliverability operation with continuous monitoring, remediation, and a price to match, aimed at teams that want the problem handled. MailGenius is a self-serve diagnostic under $80 a month with a consulting upsell attached if you want human help. Take Folderly if you want the work done; take MailGenius if you want to know what to do and will do it yourself.
Full MailGenius vs Folderly comparisonImplementation & onboarding
- Setup time
- Minutes for on-demand testing: request an address, send a message, read the result. Configuring the automatic testing on the top plan takes longer, since outgoing mail from your senders has to be routed through the test.
- Learning curve
- Low. The findings are written for marketers rather than engineers, and the AI consultant explains anything unfamiliar. The conceptual point a buyer must grasp is that a good test score is not proof your list received the mail.
- Onboarding
- Self-serve after purchase, with account credentials issued on signup. Paid deliverability consulting is available separately from the same owner if the findings need a human to act on them.
- Migration notes
- Nothing to migrate. Testing keeps no state you would need to carry between vendors beyond historical results, and switching testers is a matter of sending your next test somewhere else. If you configure automatic testing on the top plan, unwinding that routing is the only cleanup involved.
Platform, API & security
- Platforms
- Web applicationFree no-account spam testAutomatic testing of outgoing mail on the top plan
- API
- Not published as a headline self-serve capability.
- Compliance
- GDPR
- Data residency
- Not published as a customer-selectable option.
- SSO
- Not offered on the published tiers.
- Security notes
- Testing sends real message content to addresses operated by the vendor, and the top plan routes outgoing mail through automatic testing, so campaign copy and any personalization present in tested messages is visible to the platform. Avoid live customer data in test sends and review the automatic testing path before enabling it on transactional mail.
Support & resources
- Channels
- In-product AI deliverability consultantEmail supportPaid consulting from the owner's deliverability practice
- Documentation
- An official deliverability guide bundled with paid plans, plus an active blog covering deliverability practice from a consultancy perspective.
- Community
- The owner maintains a substantial public presence in email deliverability circles, which functions as the community around the product.
Company
- Founded
- 2019
- Headquarters
- United States
- Ownership
- Privately owned by Troy Ericson, who also operates EmailDeliverability.com and emailMarketing.com
- Founders
- Troy Ericson (current owner)
- Employees
- Not disclosed; small owner-operated team
- Funding
- No disclosed outside funding; acquired rather than venture-financed.
Timeline
- 2019MailGenius launches as a free online email spam testing tool and becomes a widely used entry point for senders diagnosing spam placement.
- 2022The original owners stop investing in the product; Troy Ericson, a deliverability consultant, acquires it on the last day of the year.
- 2023Spends most of the year repairing the neglected product, then publicly relaunches in October with the tool positioned as the software arm of a deliverability consultancy.
- 2024Adds AI copywriting analysis and an in-product deliverability consultant, reflecting the view that filters read content as well as headers.
- 2025Introduces the automatic testing and domain monitoring plan, moving from on-demand checks to continuous testing of all outgoing mail with unlimited-domain blacklist alerting.
Integrations
- Any sending platform, via the generated test address
- Gmail and Google Workspace as tested providers
- Microsoft Outlook and Microsoft 365 as tested providers
- Yahoo as a tested provider
- Blacklist and blocklist data sources
- Outgoing mail routing for automatic testing on the top plan
Frequently asked questions
10 questionsWhat is MailGenius?
MailGenius is an email deliverability testing tool. You send a message to an address it generates and it returns a score with itemized findings covering SPF, DKIM, and DMARC authentication, blacklist listings, broken links, HTML problems, and content and subject line issues. Paid tiers add AI copy analysis, and the top tier tests every outgoing message automatically and monitors domains for blocklist entries.
Which of the three deliverability jobs does MailGenius do?
Placement and spam testing. It does not warm mailboxes and it does not ingest DMARC aggregate reports. It checks authentication for the specific message you tested, which is not the same as monitoring who sends as your domain or reaching an enforced DMARC policy.
How much does MailGenius cost?
The basic spam test is free and requires no account. Beginner is $23 a month for sixty tests, Genius is $39 for unlimited tests plus the ability to test competitors' and prospects' emails, and the automatic testing and domain monitoring plan is $79 for continuous testing of all outgoing mail plus blacklist monitoring across unlimited domains. Annual billing takes twenty percent off.
What does the free test actually include?
It is a complete single-message diagnostic: authentication results, blacklist status, broken links, HTML and content findings, and a score with reasons. No account is required. For a sender running one campaign a month it may be all you ever need, which is unusual honesty for a category built on subscriptions.
How often can I run tests?
Sixty a month on Beginner and unlimited on Genius and the top plan. The top plan changes the question entirely by testing every outgoing message automatically rather than waiting for you to remember, which is the practical difference between catching a problem before a send and hearing about it from a customer.
Does a good MailGenius score mean my recipients got the email?
No. MailGenius assesses how filters are likely to treat your message and how your authentication, content, and reputation look. It cannot account for the personalized filtering that mailbox providers apply based on the engagement history between you and each specific recipient. A good score means nothing structural is wrong; it is not proof of inbox placement for your actual list.
What does MailGenius not do?
It does not warm mailboxes or build sender reputation, so a new or damaged sending domain will keep failing tests regardless of how many you run. It does not ingest DMARC reports or help you reach a p=reject policy. It does not render your email across clients or check dark mode layouts. Buyers routinely arrive with a warming problem and buy a testing tool, which diagnoses accurately and fixes nothing.
How does the AI copy analysis differ from the technical checks?
The technical checks look at headers, authentication, links, and blocklists. The AI layer reads the message copy and flags phrasing likely to trip content filters, then proposes rewrites. That reflects the owner's consultancy background, where copy and deliverability are treated as the same problem, and it is genuinely uncommon in a category dominated by header inspection.
Who owns MailGenius?
Troy Ericson, a deliverability consultant who also operates EmailDeliverability.com and emailMarketing.com, acquired MailGenius at the end of 2022 from owners who had stopped maintaining it, repaired it through 2023, and relaunched it that October. It is a small, privately owned product attached to a working consultancy rather than a venture-backed platform.
Should I buy MailGenius or a placement testing platform like GlockApps?
If you need defensible provider-by-provider placement data from a documented seed panel, and continuous blacklist and DMARC monitoring, GlockApps is the more rigorous instrument. If you want a fast, readable diagnosis of why a specific message is likely to be filtered, plus copy-level suggestions and, on the top plan, automatic testing of everything you send, MailGenius is the better fit and cheaper.
Editorial verdict
MailGenius is the deliverability tool most people have already used without paying for it, and the free no-account test remains a complete diagnostic for occasional senders. The paid product is worth considering for two reasons: the AI copy layer, which treats content as a deliverability variable rather than a marketing one, and the $79 plan's automatic testing of every outgoing message with unlimited-domain blacklist alerting, which no comparable tool offers at that price. Against that, there is no documented seed panel, no DMARC report monitoring, no rendering testing, and no warming, and the vendor is a small owner-operated business attached to a consultancy that will keep offering to sell you help. Buy it if you want to know why a message is likely to be filtered and want the answer in plain language. Do not buy it as a fix for a cold sending domain, because diagnosis is the whole product.
Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.