1 category · RankedMail-Tester
Standing by category
| Category | Function | Share | Rank | Negative rate | Labels | Quadrant | Since September 2026 |
|---|---|---|---|---|---|---|---|
| Email deliverability and testing tools | Marketing | 5% | 5 of 110 | 25% | 20 | criticized challenger |
Movement
By model
How each model treated Mail-Tester across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.ShowHide
By model
| Model | First choice | Alternative | Mention | Negative | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 0 | 0 | 0 | 1 | 1 |
| GPT-5.4 mini | 0 | 0 | 0 | 0 | 0 |
| Gemini 3.5 Flash | 0 | 2 | 0 | 0 | 2 |
| Perplexity Sonar | 0 | 0 | 0 | 0 | 0 |
| Grok 4.1 Fast | 0 | 1 | 1 | 1 | 3 |
| Mistral Small | 0 | 1 | 0 | 0 | 1 |
| DeepSeek V4 Flash | 0 | 0 | 0 | 1 | 1 |
| Llama 4 Maverick | 1 | 0 | 0 | 0 | 1 |
| Qwen 3.7 Flash | 0 | 0 | 0 | 0 | 0 |
| Kimi K2 | 1 | 2 | 0 | 0 | 3 |
| GLM 4.7 FlashX | 0 | 1 | 1 | 1 | 3 |
| MiniMax M2.5 | 0 | 1 | 0 | 0 | 1 |
| GPT-6 Luna | 1 | 0 | 0 | 0 | 1 |
| Muse Glimmer 30B | 0 | 2 | 0 | 1 | 3 |
By framing
What the models said for it
Verbatim evidence the judge attached to positive labels.
“Mail-Tester for occasional pre-send checks of a message and its sending setup. It allows up to 3 free tests per day.” GPT-6 Luna · Email deliverability · budget prompt · first choice
“The best email deliverability tool for a company with a limited budget is Mail-Tester or Unspam for pre-send testing” Llama 4 Maverick · Email deliverability · budget prompt · first choice
“Start with free tools → Google Postmaster Tools + MXToolbox + Mail-Tester free tier” Kimi K2 · Email deliverability · budget prompt · first choice
“Best for: Fast, free, one-off deliverability checks... However, it lacks the deep inbox-by-inbox placement data of GlockApps.” Gemini 3.5 Flash · Email deliverability · comparative prompt · alternative
And against it
Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.
“Mail-Tester scores against a single seed address, so it can't tell you where your email lands across a multi-ISP seed network” Claude Haiku 4.5 · Email deliverability · negative prompt · hard negative
“These are inaccurate and misleading... do not base business decisions on them.” DeepSeek V4 Flash · Email deliverability · negative prompt · hard negative
“Avoid: Relying solely on these web-based scores. They are useful for a quick syntax check but should not be your primary deliverability testing tool.” GLM 4.7 FlashX · Email deliverability · negative prompt · soft negative
“Free tools like Mail Tester and MxToolbox handle basic checks but lack the depth for production workflows.” Muse Glimmer 30B · Email deliverability · negative prompt · soft negative
Named alongside
The products named in the same answers as Mail-Tester, over the 52 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and Mail-Tester was named but was not.ShowHide
Named alongside
What carried it into the answer
Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 51 of the 52 answers that named Mail-Tester and are not a share of its labels.
Domains cited
192 of the 192 domain citations in answers naming Mail-Tester came from somebody else's page.
Pages cited
Pages are listed as the models cited them.
Search and answers
mailtester.com ranks 4 on Google for the category's searches. In the answers, Mail-Tester takes 5% of first choices and GlockApps takes 34%.ShowHide
Search and answers
In search
Google, US estimates- Searches for its name, Google
- 5,400 a month (“mail-tester”)
- AI search demand for its name, est.
- 93 a month
- Organic visits to its site
- about 3,496 a month
- Searches its site ranks for
- 905 · 17 in the top three
- Sites linking to it
- 1,582
- Paid Google search
- No ads found in the estimate; that does not mean it runs none
In answers
This edition- First choices
- 6 across its categories
- Named in
- 52 answers
- Its own site cited
- in 51 of the answers that named it
Search figures are US estimates from DataForSEO, read October 5, 2026; AI search demand is its modeled, directional estimate, not a count of queries to any assistant. The answers are this edition's. Two measurements side by side: neither is read as the cause of the other.
What it publishes
ShowHide
What it publishes
ShowHide| Kind | Pages | Last 90 days | 2025-10 to 2026-09 | Latest | Categories named |
|---|---|---|---|---|---|
| Blog | 9,795 | 31 | 2026-09-27 | Email verification, CRM | |
| Comparison | 460 | 77 | 2026-09-27 | Email verification, CRM | |
| Template or tool | 63 | 31 | 2026-09-27 | Email verification | |
| Glossary or explainer | 61 | 27 | 2026-09-19 | Email verification | |
| Podcast or video | 18 | 18 | 2026-08-25 | Email verification | |
| Webinar or virtual event | 6 | 6 | 2026-09-03 | ||
| Case study | 4 | 4 | 2026-09-21 | ||
| News or press | 3 | 3 | 2026-08-31 | ||
| Conference or event | 2 | 2 | 2026-09-05 | Email verification | |
| Report or ebook | 1 | 1 | 2026-08-10 |
Most recent
- 2026-09-27Predictive analytics email validation one time vs subscribers comparison
- 2026-09-27Using email validation to clean dormant lists for reactivation blog
- 2026-09-27Email verification service features classify buyers purchase frequency blog
- 2026-09-27Building re engagement sequences with verified high quality emails blog
- 2026-09-27Email address validation in non production environments safely blog
- 2026-09-27Set up email records cloudflare proxy blog
How it is countedHide how it is counted
Every page mailtester.com exposes, subdomains included. Kind is read from the address and title. The last 90 days, the latest date and the twelve months count pages by when they were published, from the site's feeds, a date in the address, or the page's own publication date, read from up to a hundred of its most recently changed pages; a page that says only when it last changed is counted in its kind but not in when, so the recent counts are a floor, and a kind none of whose pages gives a publication date reads undated. Of its titles that name a category, most name email verification (1324); 0 name the category the models place it in. An event counts as online when its address or title says so (webinar, on demand, virtual or online summit); a conference, summit, trade show, expo or roadshow that does not say so is counted as a conference or event, which on a vendor's site is mostly in person. Read September 29, 2026.
Names read as Mail-Tester
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Claim this page
Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when Mail-Tester's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as Mail-Tester, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.
What a new claim receivesHide what a new claim receives
A new claim receives the current edition's vendor brief for Mail-Tester by email, built from the raw record of the edition. It shows:
- where Mail-Tester is named, by buyer and by framing, and which cells hold its first choices;
- the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
- its vocabulary against the segment leader's, and the pages the models cited;
- who was chosen in the answers that did not name Mail-Tester, and every reason the record gives;
- a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
- one page of published figures cleared to show a buyer.