# Mail-Tester: how AI models rank it, November 2026

Gane Index, November 2026 Edition. Named in 27 judge labels across 1 category by 11 of 14 models. Page: https://www.gane.ai/index/gtm/vendors/mail-tester

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| [Email deliverability and testing tools](https://www.gane.ai/index/gtm/marketing/email-deliverability-and-testing/index.md) | 2% | 11 | 19% | 27 |

## What the models said for it

- "Start with Unspam's free tier or Mail-Tester if you need immediate, low-cost testing." (Kimi K2, Email deliverability)
- "Instant spam score (0–10) based on content, authentication, and reputation. No signup needed for basic use." (Grok 4.20, Email deliverability)
- "Cited as a best deliverability testing tool in 2026 with a free spam score, real inbox-placement testing" (Muse Glimmer 30B, Email deliverability)
- "Use well-established tools like Mailtrap, GlockApps, MxToolbox, Mail-tester, and NeverBounce" (Mistral Small, Email deliverability)

## And against it

- "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, Email deliverability)
- "Email "spam score" checkers such as Mail-Tester: good for finding technical problems, but a favorable score does not predict inbox placement." (Perplexity Sonar, Email deliverability)
- "Use these only as a diagnostic aid, not as a primary decision-making tool." (DeepSeek V4 Flash, Email deliverability)
- "Often criticized for superficial insights ... followed by heavy upselling" (Grok 4.20, Email deliverability)

## 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 |

## Sources returned with these answers

The sites and pages cited by the answers that named Mail-Tester, from 62 of the 70 answers that named it (only the models that return a source list).

### Domains cited

- unspam.email: 30
- myemailverifier.com: 26
- emailtooltester.com: 25
- mailtester.com: 21 (its own site)
- toolradar.com: 20
- prospeo.io: 19
- softwaresuggest.com: 19
- g2.com: 18
- salesdorado.com: 18
- sendlayer.com: 17

### Pages cited

- https://myemailverifier.com/blog/email-deliverability-tools: 26
- https://unspam.email/articles/email-deliverability-softwares: 21
- https://sendlayer.com/blog/best-email-deliverability-tools: 17
- https://toolradar.com/best/email-deliverability/for/small-businesses: 16
- https://emailtooltester.com/en/email-deliverability-test: 15
- https://salesdorado.com/en/inbound-marketing/email-testing-tools: 14
- https://softwaresuggest.com/email-deliverability-tools: 12
- https://omnisend.com/blog/email-deliverability-tools: 11

## What it publishes

Every page mailtester.com exposes, read 2026-09-29: 10428 addresses. By kind, pages and the last 90 days:

- blog: 9795 pages, 31 in the last 90 days, latest 2026-09-27
- case study: 4 pages, 4 in the last 90 days, latest 2026-09-21
- webinar or virtual event: 6 pages, 6 in the last 90 days, latest 2026-09-03
- conference or event: 2 pages, 2 in the last 90 days, latest 2026-09-05
- report or ebook: 1 pages, 1 in the last 90 days, latest 2026-08-10
- comparison: 460 pages, 77 in the last 90 days, latest 2026-09-27
- template or tool: 63 pages, 31 in the last 90 days, latest 2026-09-27
- glossary or explainer: 61 pages, 27 in the last 90 days, latest 2026-09-19
- podcast or video: 18 pages, 18 in the last 90 days, latest 2026-08-25
- news or press: 3 pages, 3 in the last 90 days, latest 2026-08-31
- Recent: 2026-09-27 comparison: Predictive analytics email validation one time vs subscribers https://mailtester.com/blog/predictive-analytics-email-validation-one-time-vs-subscribers
- Recent: 2026-09-27 blog: Using email validation to clean dormant lists for reactivation https://mailtester.com/blog/using-email-validation-to-clean-dormant-lists-for-reactivation
- Recent: 2026-09-27 blog: Email verification service features classify buyers purchase frequency https://mailtester.com/blog/email-verification-service-features-classify-buyers-purchase-frequency
- Recent: 2026-09-27 blog: Building re engagement sequences with verified high quality emails https://mailtester.com/blog/building-re-engagement-sequences-with-verified-high-quality-emails
- Recent: 2026-09-27 blog: Email address validation in non production environments safely https://mailtester.com/blog/email-address-validation-in-non-production-environments-safely
- Recent: 2026-09-27 blog: Set up email records cloudflare proxy https://mailtester.com/blog/set-up-email-records-cloudflare-proxy

## Record

- Method: https://www.gane.ai/index/gtm/methodology
- License: CC BY 4.0. Cite as Gane Index, November 2026 Edition, www.gane.ai/index/gtm.