Email deliverability and testing tools · RankedMail-Tester
Mail-Tester is an email deliverability testing tool that checks a message's authentication and content and gives it a spam score · mailtester.com ↗
Read the same way at every company size.
The standing depends on who is buying. Every model is asked the same questions for each company size.
GlockApps is first at 25%.
GlockApps is first at 38%. 0 of 14 models made it the first choice when asked directly.
Validity Everest is first at 46%.
Why models recommend it
“Start with Unspam's free tier or Mail-Tester if you need immediate, low-cost testing.”Kimi K2 · Budget-constrained question · first choice
“Instant spam score (0–10) based on content, authentication, and reputation. No signup needed for basic use.”Grok 4.20 · Comparative question · alternative
“Cited as a best deliverability testing tool in 2026 with a free spam score, real inbox-placement testing”Muse Glimmer 30B · Comparative question · alternative
“Use well-established tools like Mailtrap, GlockApps, MxToolbox, Mail-tester, and NeverBounce”Mistral Small · Negative question · alternative
What gives them pause
“Mail-Tester does one thing well: it runs your email through SpamAssassin and checks your SPF, DKIM, and DMARC records. That's useful. It's also not enough.”Muse Glimmer 30B · Negative question · warning
“Email "spam score" checkers such as Mail-Tester: good for finding technical problems, but a favorable score does not predict inbox placement.”Perplexity Sonar · Negative question · warning
“Use these only as a diagnostic aid, not as a primary decision-making tool.”DeepSeek V4 Flash · Negative question · warning
“Often criticized for superficial insights ... followed by heavy upselling”Grok 4.20 · Negative question · warning
Also on the shortlist
The products named in the same answers as Mail-Tester, over the 70 answers that named it, and how often each was the first choice instead.
| Product | Named together | Picked instead | |
|---|---|---|---|
| 62 | 20 | Compare → | |
| 47 | 2 | Compare → | |
| 44 | 7 | Compare → | |
| 30 | 0 | Compare → | |
| 29 | 1 | Compare → | |
| 29 | 1 | View → | |
| 25 | 0 | Compare → | |
| 24 | 7 | Compare → | |
| 21 | 1 | View → | |
| 21 | 0 | View → |
What the models named instead of Mail-Tester →
A side-by-side page exists where both products are among a category's top eight.
How this is measured
Fourteen AI models from 12 labs are asked the same buying questions six ways, for three company sizes. Standings refresh every edition.
Gane sells AI visibility software. No company can pay to change a result.
Read the method →Sources returned with these answers
Fourteen of the fourteen models returned a source list in this edition: five return the pages they cited and nine the search results they consulted. These counts come from 62 of the 70 answers that named Mail-Tester and are not a share of its labels.
Domains cited
192 of the 213 domain citations in answers naming Mail-Tester came from a third party's page.
Pages cited
Pages are listed as the models cited them.
By model
| Model | First choice | Alternative | Mention | Warning | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 0 | 0 | 0 | 1 | 1 |
| GPT-5.4 mini | 0 | 0 | 0 | 0 | 0 |
| Gemini 3.5 Flash | 0 | 3 | 0 | 0 | 3 |
| Perplexity Sonar | 0 | 1 | 1 | 1 | 3 |
| Grok 4.20 | 0 | 1 | 1 | 1 | 3 |
| Mistral Small | 0 | 2 | 1 | 0 | 3 |
| DeepSeek V4 Flash | 0 | 2 | 1 | 1 | 4 |
| Llama 4 Maverick | 0 | 0 | 0 | 0 | 0 |
| Qwen 3.7 Flash | 0 | 1 | 0 | 0 | 1 |
| Kimi K2 | 1 | 1 | 0 | 0 | 2 |
| GLM 4.7 FlashX | 0 | 0 | 2 | 0 | 2 |
| MiniMax M2.5 | 0 | 0 | 1 | 0 | 1 |
| GPT-6 Luna | 0 | 0 | 0 | 0 | 0 |
| Muse Glimmer 30B | 0 | 3 | 0 | 1 | 4 |
What it publishes
| 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.