The Mail-Tester Insider’s Guide
Everything we know about Mail-Tester 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.
Mail-Tester
The Insider’s Guide
Send an email to a test address and get a spam score out of 10
Every plan, grade, refund rule and rival among email verification and deliverability tools, read from Mail-Tester’s own pages.
Made by Mail Tester LLC · checked Nov 12, 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 Mail-Tester’s own pages, its app-store listings and our grades. Every fact in it is on Mail-Tester’s page too, where it is kept up to date. Checked Nov 12, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.8
GPA, above 58 of the 61 other email verification and deliverability tools we grade
Mail-Tester gives each visitor a random address to send a message to, then analyzes the message, the sending server and the sending IP and shows a score out of 10 with a report of what is and is not configured properly. The web interface is free for a few tests a day. Paid accounts add a JSON API, an iframe, white-labeling and longer result history.
To get you started, here are 9 things to know about Mail-Tester, taken from its own pages and our grades.
You send a mail to a displayed address and read the result, so there is nothing to set up.
- 1
Best for checking one email's spam score
Mail Tester scores one test email out of 10 and shows what is wrong with it.
- 2
Paid plans start at $10 a month
As its pricing page puts it: $10 per month for 50 tests; or $5 once for 10 tests.
- 3
There is a free plan
Free web interface: 3 tests per 24 hours, results kept for 7 days.
- 4
It runs on Web
Web.
- 5
Spam score
Scores a sent message out of 10 using a default SpamAssassin install, with the sign reversed so that a higher score is better.
- 6
Configuration report
Reviews the message, the mail server and the sending IP, and lists what is set up correctly and what is not.
- 7
JSON API and iframe
Paid plans let you embed mail-tester results in your own software.
- 8
A 2.8 GPA, above 58 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
Your call
You could make the core of Mail-Tester for yourself: reports.
Mail-Tester at a glance
- Pricing
- Free plan, from $10 per month for 50 tests; or $5 once for 10 tests
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web
- Made by
- Mail Tester LLC
- Category
- Email Verification & Deliverability
- Our grade
- 2.8 GPA, good
The report card
Best for checking one email's spam score
Mail Tester scores one test email out of 10 and shows what is wrong with it. Free gives you 3 tests in 24 hours with no account, but it runs a stock SpamAssassin setup that other filters do not match, tests one message at a time and does not monitor anything over time.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | B | Subscriptions start at $10 a month for 50 tests, level with the $10 cheaper quarter of deliverability tools. A 10-test pack is $5, and prices exclude VAT. |
| Free plan and trial | B | 3 tests in any 24 hours with no account, results kept for 7 days. One person checking now and then can live on that. |
| Features | C | A spam score, a configuration report and a JSON API. It uses a stock SpamAssassin setup, so a perfect score does not guarantee inbox placement, and it does one message at a time. It does that job fully, and it is a smaller job. |
| Ease of use | B | No store rating on record. You send a mail to a displayed address and read the result, so there is nothing to set up. |
| Platforms and integrations | B | Web only, with a JSON API, an iframe and white-labeling. No desktop or phone app. |
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 Mail-Tester is for
- Fits if you want to check one newsletter or template before sending
- Works for developers who want the score inside their own tool
Who it is not for
- Tight if you test more than 3 times a day on free, with results kept for 7 days
- Skip it if you want ongoing monitoring, since it tests one message at a time
- Watch out: the score comes from SpamAssassin and other spam filters differ
- Watch out: prices exclude VAT
Good to know
Good for
- Checking one newsletter or sending setup before a send
- Email tools that want a spam test inside their own product
- Occasional use without an account
Worth knowing
- Scores come from a stock SpamAssassin setup; the FAQ says other spam filters differ, so a perfect score does not guarantee inbox placement.
- The free version allows 3 tests in 24 hours and keeps results for 7 days; an account with your own prefix keeps them 30 days.
- Prices exclude VAT.
- It tests one message at a time and does not monitor sending over time.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$10
A month to start. There is a free plan too
Mail-Tester has a free plan. Paid plans start at $10 per month for 50 tests; or $5 once for 10 tests.
One person checking now and then can live on that.
Free web interface
$0
3 tests in any 24 hours, no account needed, results available for 7 days.
10 Tests
$5
one-time
A pack of 10 extra tests at $0.50 each. Larger one-time packs run up to 15,000 tests for $700.
50 Tests / Month
$10
per month for 50 tests
Subscription with an account; $0.20 per test.
500 Tests / Month
$25
per month for 500 tests
$0.05 per test.
2,000 Tests / Month
$80
per month for 2,000 tests
Marked most popular on the page; $0.04 per test.
7,500 Tests / Month
$250
per month for 7,500 tests
$0.0333 per test. A 25,000-plus tier is quoted on request.
The free plan
Free web interface: 3 tests per 24 hours, results kept for 7 days.
Read from mail-tester.com on Nov 12, 2026.
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
Send an email to a test address and get a spam score out of 10. Here is what it does, as its own site describes it, and what it covers: public API, reports.
A spam score, a configuration report and a JSON API.
- Spam score
- Scores a sent message out of 10 using a default SpamAssassin install, with the sign reversed so that a higher score is better.
- Configuration report
- Reviews the message, the mail server and the sending IP, and lists what is set up correctly and what is not.
- JSON API and iframe
- Paid plans let you embed mail-tester results in your own software.
- White-labeling and custom CSS
- Accounts can restyle the result page and fully white-label it, after contacting the company to authorize their domain.
- Usage statistics and history
- Daily, weekly and monthly usage statistics and a list of the last 30 days of tests, with no ads on results.
Where it runs
- Web
What it works with
Its own pages name no integrations.
Mail-Tester is made by Mail Tester LLC.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
58/61
Other email verification and deliverability tools it is graded above
Mail-Tester's GPA of 2.8 is higher than 58 of the 61 other email verification and deliverability tools we grade, and level with 2.
It stands best on free plan and trial (B, above 53 of 61) and worst on features (C, above 0).
Its paid plans start at $10 a month, against a middle price of $21.50 for the category: 5 of the 43 others that charge start lower.
On features, ease of use and platforms it scores 2.7 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 62 email verification and deliverability tools we grade, cut by the letter each got. Mail-Tester’s own letter is outlined.
- BValue for moneyAbove 45 of 61
- BFree plan and trialAbove 53 of 61
- CFeaturesAbove 0 of 61
- BEase of useAbove 53 of 61
- BPlatforms and integrationsAbove 28 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. Mail-Tester 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.
Your call
You could make the core of Mail-Tester for yourself: reports.
What you would give up is listed below. Whether that is worth the price is your call. It costs $120 a year.
What you could make
- Reports: an app builder makes this well.
- It runs in a browser, which is where something home-made would run too.
What you could not
- An API that other software can build on.
What this rests on. Mail-Tester’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
GlockApps, MxToolbox, MailReach, Warmy and InboxAlly
The 5 tools Mail-Tester is most often weighed against, with where each one differs from it.
- 2.2GPA
GlockApps
Free plan · from $59/mo
Inbox placement testing with DMARC analytics and uptime monitoring.
- Mail-Tester also covers reports.
- GlockApps also covers dMARC.
- 2.0GPA
MxToolbox
Free plan · from $129/mo
Email and DNS lookups plus blacklist and DMARC monitoring.
- MxToolbox also covers dMARC.
- 1.8GPA
MailReach
From $20/mo
Email warm-up and inbox placement tests, priced per mailbox.
- Mail-Tester has a free plan. MailReach does not.
- Mail-Tester also covers reports.
- MailReach also covers inbox warm-up.
- 2.4GPA
Warmy
Free trial · from $49/mo
Email warm-up with seed testing, verification and DMARC monitoring.
- Mail-Tester has a free plan. Warmy does not, though it has a free trial.
- Only Warmy lists a browser extension.
- Mail-Tester also covers reports.
- 2.0GPA
InboxAlly
Free trial · from $149/mo
Email warm-up and reputation repair through a network of seed inboxes.
- Mail-Tester has a free plan. InboxAlly does not, though it has a free trial.
- Mail-Tester also covers reports.
- InboxAlly also covers inbox warm-up.
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 Mail-Tester free?
Mail-Tester has a free plan. Free web interface: 3 tests per 24 hours, results kept for 7 days.
How much does Mail-Tester cost?
Mail-Tester lists 6 plans. Free web interface: $0.
What platforms does Mail-Tester work on?
Mail-Tester is available on Web.
Does Mail-Tester have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Mail-Tester is listed for Web.
Does Mail-Tester have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Mail-Tester is listed for Web.
Is Mail-Tester open source?
Mail-Tester is not described as open source on its own site, as read on Nov 12, 2026.
Does Mail-Tester have an API?
Yes. Mail-Tester offers a public API, according to its own site.
Who makes Mail-Tester?
Mail-Tester is made by Mail Tester LLC.
What are the alternatives to Mail-Tester?
The closest alternatives to Mail-Tester in our directory are GlockApps, MxToolbox, MailReach, Warmy and InboxAlly.
How does Mail-Tester compare with other email verification and deliverability tools?
Mail-Tester's GPA of 2.8 is higher than 58 of the 61 other email verification and deliverability tools we grade, and level with 2.
Is Mail-Tester good value for money?
ToolGPA grades Mail-Tester B for value for money. Its paid plans start at $10 a month, against a middle price of $21.50 for the category: 5 of the 43 others that charge start lower.
Could I make my own version of Mail-Tester?
You could make the core of Mail-Tester for yourself: reports. What you would give up is listed below.
Where this guide comes from
The prices, plans, platforms and features were read from Mail-Tester’s own pages on Nov 12, 2026, and the grades were given on Nov 12, 2026. Graded from this listing, whose facts were read from Mail Tester's own pages on 12 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 Mail Tester LLC. Prices change, so check mail-tester.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
- Mail-Tester, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/mail-tester
- 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, "Mail-Tester: The Insider's Guide", checked Nov 12, 2026. https://toolgpa.com/tools/mail-tester
Know someone choosing between email verification and deliverability tools?
Send them this guide: toolgpa.com/tools/mail-tester/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email verification and deliverability tools after Mail-Tester, 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
- Reoon Email Verifier Insider's GuideBulk and real-time email verification with refunds on unknowns2.8 GPA
- URIports Insider's GuideDMARC, TLS-RPT and CSP report monitoring in one platform2.8 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 Mail-Tester’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. Mail-Tester is a trademark of its owner, and this guide is not made, paid for or approved by Mail Tester LLC. Prices and plans change: check mail-tester.com before you buy.