The Mailhardener Insider’s Guide
Everything we know about Mailhardener in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Mailhardener
The Insider’s Guide
DMARC, SPF, DKIM, MTA-STS and BIMI monitoring and hosting
Every plan, grade, refund rule and rival among email verification and deliverability tools, read from Mailhardener’s own pages.
Made by Mailhardener · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Mailhardener’s own pages, its app-store listings and our grades. Every fact in it is on Mailhardener’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.0
GPA, above 8 of the 61 other email verification and deliverability tools we grade
Mailhardener monitors a domain's email security settings and aggregates DMARC and SMTP TLS reports. It hosts MTA-STS policies and BIMI assets, watches DNS for changes and explains reports in plain English. It is free for one domain for personal or evaluation use, with paid tiers for commercial domains.
To get you started, here are 9 things to know about Mailhardener, taken from its own pages and our grades.
The free plan is for personal or evaluation use only, and the paid plans are in euros.
- 1
Best for DMARC reports and MTA-STS for a small number of domains
Mailhardener reads DMARC and TLS reports and hosts MTA-STS and BIMI files.
- 2
Paid plans start at about $18.53 a month
As its pricing page puts it: €19 per month for up to 10 domains, or €199 per year.
- 3
There is a free plan
Free plan for personal or evaluation use: 1 domain, 1 user account and 1 month of data retention.
- 4
It runs on Web
Web.
- 5
DMARC reporting
Aggregate (rua) and failure (ruf) reports show every sender using the domain, with a plain-English breakdown. The vendor says its algorithm separates forwarding services from malicious senders.
- 6
SMTP TLS reporting
TLS failures reported by sending servers are aggregated and analyzed, with warnings by email.
- 7
Hosted MTA-STS and BIMI assets
Mailhardener serves the MTA-STS policy and BIMI assets so a domain can adopt them without running a web server.
- 8
A 2.0 GPA, above 8 of 61
That is against the other email verification and deliverability tools we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
The plain part of Mailhardener you could make: reports. What surrounds it you could not. The 1 things listed below take a company, not a weekend.
Mailhardener at a glance
- Pricing
- Free plan, from €19 per month for up to 10 domains, or €199 per year
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web
- Made by
- Mailhardener
- Category
- Email Verification & Deliverability
- Our grade
- 2.0 GPA, fair
The report card
Best for DMARC reports and MTA-STS for a small number of domains
Mailhardener reads DMARC and TLS reports and hosts MTA-STS and BIMI files. The free plan is for personal or evaluation use only, and the paid plans are in euros.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | Standard is EUR 19 a month for up to 10 domains (EUR 199 a year), close to the category's middle of $23. |
| Free plan and trial | C | A free plan with 1 domain, 1 user and 1 month of data, but only for personal or evaluation use, not commercial domains. |
| Features | C | DMARC and TLS reporting, hosted MTA-STS and BIMI, DNS change monitoring. The listing could not confirm which tiers carry the API and SSO. |
| Ease of use | C | No rating on record. You change DNS records and read reports as they arrive. |
| Platforms and integrations | C | Web only, with no integrations listed on the vendor pages. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Mailhardener is for
- Fits if you run up to 10 domains and want reports and hosted MTA-STS
- Works for a personal domain you only want to look at
Who it is not for
- Skip it if your domain is a company's, as the free plan is for personal or evaluation use
- Tight if you want more than 3 months of history, as 12 months needs Large at EUR 99 a month
- Watch out: prices are in euros and no dollar price was readable
- Watch out: the page does not make clear which tiers have API access and SSO
Good to know
Good for
- Small businesses monitoring up to 10 domains
- Managed service providers (separate MSP package)
- Personal or non-commercial domains, which the free plan covers
Worth knowing
- Prices are shown in euros; the page has a currency selector, but a dollar price was not readable from the server.
- The free plan is for personal or evaluation use only, not commercial domains.
- The comparison table lists API access, SSO and periodic reports, but which tiers include them could not be read from the page text.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
~$18.53
A month to start. There is a free plan too
Mailhardener has a free plan. Paid plans start at €19 per month for up to 10 domains, or €199 per year.
Free
€0
1 domain, 1 user, fair-use report volume and 1 month of retention, for personal or evaluation use.
Standard
€19
per month for up to 10 domains, billed monthly (€199 per year)
3 months of retention, unlimited users, hosted MTA-STS, BIMI hosting, DNS monitoring and technical support.
Large
€99
per month for up to 100 domains, billed monthly (€999 per year)
12 months of retention, limited onboarding assistance and payment by invoice, plus the Standard features.
Enterprise
Custom
No domain limit, custom contract length, assisted onboarding, a private instance option and compliance agreements such as a HIPAA BAA.
The free plan
Free plan for personal or evaluation use: 1 domain, 1 user account and 1 month of data retention.
Read from mailhardener.com on Nov 13, 2026.
Ways to pay less
Annual discount
Save with annual billing
Standard is €199 a year (saves €29) and Large is €999 a year (saves €189), against the monthly prices.
Stated on mailhardener.com
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
DMARC, SPF, DKIM, MTA-STS and BIMI monitoring and hosting. Here is what it does, as its own site describes it, and what it covers: reports, dMARC.
DMARC and TLS reporting, hosted MTA-STS and BIMI, DNS change monitoring.
- DMARC reporting
- Aggregate (rua) and failure (ruf) reports show every sender using the domain, with a plain-English breakdown. The vendor says its algorithm separates forwarding services from malicious senders.
- SMTP TLS reporting
- TLS failures reported by sending servers are aggregated and analyzed, with warnings by email.
- Hosted MTA-STS and BIMI assets
- Mailhardener serves the MTA-STS policy and BIMI assets so a domain can adopt them without running a web server.
- DNS change monitoring
- Email-related DNS records are monitored, and a notification explains what a change does to protection.
- Domain inspector
- Shows how SPF, DKIM, DMARC and related records are configured and flags common mistakes.
- Multi-user access and auditors
- Paid tiers support role- and domain-based access control, several organizations per login and read-only auditor access.
Where it runs
- Web
What it works with
Its own pages name no integrations.
Mailhardener is made by Mailhardener.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
8/61
Other email verification and deliverability tools it is graded above
Mailhardener's GPA of 2.0 is higher than 8 of the 61 other email verification and deliverability tools we grade, and level with 14.
Its paid plans start at about $18.53 a month, against a middle price of $21.50 for the category: 15 of the 43 others that charge start lower.
On features, ease of use and platforms it scores 2.0 out of 4. 10 tools score higher and cost less.
Each grade against the category
Every bar is all 62 email verification and deliverability tools we grade, cut by the letter each got. Mailhardener’s own letter is outlined.
- CValue for moneyAbove 9 of 61
- CFree plan and trialAbove 9 of 61
- CFeaturesAbove 0 of 61
- CEase of useAbove 2 of 61
- CPlatforms and integrationsAbove 0 of 61
Price against what you get
Each dot is one of 45 email verification and deliverability tools. Further left costs less; higher up scores better on features, ease of use and platforms. Mailhardener is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
The plain part of Mailhardener you could make: reports. What surrounds it you could not. The 1 things listed below take a company, not a weekend.
That makes this kind of software worth paying for, not this one in particular: 39 of the 61 other email verification and deliverability tools grade higher. It costs $222.32 a year.
What you could make
- Reports: an app builder makes this well.
What you could not
- Reading the reports inbox providers send about your domain.
What this rests on. Mailhardener’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
dmarcian, PowerDMARC, EasyDMARC, Suped and Dmarcly
The 5 tools Mailhardener is most often weighed against, with where each one differs from it.
- 2.2GPA
dmarcian
Free plan · from $19.99/mo
DMARC report processing and policy deployment, by a spec co-author.
- Mailhardener also covers reports.
- 1.8GPA
PowerDMARC
Paid
DMARC reporting with hosted SPF, DKIM, BIMI and MTA-STS records.
- Mailhardener has a free plan. PowerDMARC does not.
- Mailhardener also covers reports.
- 2.0GPA
EasyDMARC
Free trial · from $35.99/mo
DMARC setup, reporting and managed SPF, DKIM and BIMI records.
- Mailhardener has a free plan. EasyDMARC does not, though it has a free trial.
- Mailhardener also covers reports.
- 2.2GPA
Suped
Free plan · from $19/mo
- 2.2GPA
Dmarcly
Free trial · from $17.99/mo
DMARC monitoring with a dashboard, SPF flattening and alerts.
- Mailhardener has a free plan. Dmarcly does not, though it has a free trial.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Mailhardener free?
Mailhardener has a free plan. Free plan for personal or evaluation use: 1 domain, 1 user account and 1 month of data retention.
How much does Mailhardener cost?
Mailhardener lists 4 plans. Free: €0.
What platforms does Mailhardener work on?
Mailhardener is available on Web.
Does Mailhardener offer any discounts?
Mailhardener publicly lists the following: Save with annual billing.
Does Mailhardener have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Mailhardener is listed for Web.
Does Mailhardener have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Mailhardener is listed for Web.
Is Mailhardener open source?
Mailhardener is not described as open source on its own site, as read on Nov 13, 2026.
Who makes Mailhardener?
Mailhardener is made by a company of the same name.
What are the alternatives to Mailhardener?
The closest alternatives to Mailhardener in our directory are dmarcian, PowerDMARC, EasyDMARC, Suped and Dmarcly.
How does Mailhardener compare with other email verification and deliverability tools?
Mailhardener's GPA of 2.0 is higher than 8 of the 61 other email verification and deliverability tools we grade, and level with 14.
Is Mailhardener good value for money?
ToolGPA grades Mailhardener C for value for money. On features, ease of use and platforms it scores 2.0 out of 4.
Could I make my own version of Mailhardener?
The plain part of Mailhardener you could make: reports. What surrounds it you could not.
Where this guide comes from
The prices, plans, platforms and features were read from Mailhardener’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from Mailhardener's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Mailhardener. Prices change, so check mailhardener.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Mailhardener, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/mailhardener
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Mailhardener: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/mailhardener
Know someone choosing between email verification and deliverability tools?
Send them this guide: toolgpa.com/tools/mailhardener/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email verification and deliverability tools after Mailhardener, each with an Insider's Guide of its own.
- Email Verification & Deliverability Insider's GuideEvery one of the 63 email verification and deliverability tools we grade, compared
- QuickEmailVerification Insider's GuideBulk email list cleaning and a real-time verification API3.0 GPA
- Mail-Tester Insider's GuideSend an email to a test address and get a spam score out of 102.8 GPA
- Reoon Email Verifier Insider's GuideBulk and real-time email verification with refunds on unknowns2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Mailhardener’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Mailhardener is a trademark of its owner, and this guide is not made, paid for or approved by Mailhardener. Prices and plans change: check mailhardener.com before you buy.