Email deliverability and testing tools · November 2026 Edition
MailReach vs Mail-Tester
Zero of fourteen models named MailReach first on the direct prompt; zero named Mail-Tester. MailReach was named by ten of the fourteen models and Mail-Tester by eleven and MailReach carries 25 labels and Mail-Tester 27, so the shares are not directly comparable.
Named in one category this edition.
Named in one category this edition.
First-choice share2%2%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate8%19%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#6#8A position in a field of 19; printed, not drawn.
Labels2527A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, MailReach reading right to left. Rank and label count are printed, not drawn.GlockApps was named alongside these two in twelve of the fourteen direct answers. GlockApps vs MailReach · GlockApps vs Mail-Tester · Google Postmaster Tools vs MailReach
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the email deliverability and testing tools page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
MailReachFirst choices, of fourteen modelsMail-Tester
Direct00
Paraphrase10
Comparative00
Budget-constrained01
Scale-constrained00
Negative002 against MailReach · 5 against Mail-Tester
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Across every category in the November 2026 Edition, MailReach and Mail-Tester were named in the same answer twenty-five times, of the 59 answers naming MailReach and the 70 naming Mail-Tester. In those answers Mail-Tester took the first choice two times and MailReach zero.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where MailReach and Mail-Tester stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | ||
| GPT-5.4 mini | ||||||
| Gemini 3.5 Flash | | | | |||
| Perplexity Sonar | | | | | | |
| Grok 4.20 | | | ||||
| Mistral Small | | | ||||
| DeepSeek V4 Flash | | | | |||
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | |||||
| Kimi K2 | | | | | ||
| GLM 4.7 FlashX | | |||||
| MiniMax M2.5 | | |||||
| GPT-6 Luna | ||||||
| Muse Glimmer 30B | | | | |
MailReach Mail-Tester first choice named as an alternative argued againstblank: not namedEach cell is one answer, MailReach on the left and Mail-Tester on the right.The direct prompt
The plain question, one answer per model, grouped by where MailReach and Mail-Tester stood in it.
Neither was the first choice, one was named
5 of 14 modelsThe answer put something else first and named one of the two as an alternative.Claude Haiku 4.5Warmy alternatives: Act-On, GlockApps, MailReach, Mailtrap Email Marketing
Perplexity SonarGlockApps alternatives: EasyDMARC, Google Postmaster Tools, MailReach, Microsoft SNDS, NeverBounce, Validity Everest, ZeroBounce, dmarcian
Llama 4 MaverickGlockApps alternatives: MailReach, Validity Everest
Kimi K2Allegrow alternatives: GlockApps, MailReach
GLM 4.7 FlashXGlockApps alternatives: Allegrow, MailReach
Neither was named
9 of 14 modelsThe answer made no first choice from these two in this category.GPT-5.4 miniLitmus alternatives: Brevo, HubSpot, Salesforce/Marketing Cloud, ZeroBounce
Gemini 3.5 FlashGlockApps alternatives: Folderly, Google Postmaster Tools, Mailgun Optimize, Mailtrap Email Sandbox, Microsoft Smart Network Data Services (SNDS) / Microsoft 365 Admin Insights
Grok 4.20GlockApps alternatives: Allegrow, Validity Everest
Mistral SmallAllegrow, Validity Everest alternatives: Litmus
DeepSeek V4 FlashHubSpot Sales Hub alternatives: GlockApps, Klaviyo, Lemlist, Mailgun, Outreach, Salesloft, SendGrid
Qwen 3.7 FlashGlockApps, ZeroBounce alternatives: Kickbox, NeverBounce, Red Sift OnDMARC, SendForensics, Suped, Validity Everest
MiniMax M2.5HubSpot Sales Hub, ZeroBounce alternatives: Copper, GlockApps, MXToolbox
GPT-6 LunaGlockApps alternatives: Google Postmaster Tools, Validity Engage
Muse Glimmer 30BGlockApps, MailGenius alternatives: Allegrow, Amplemarket
Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Mail-Tester leads by four points.
Mail-Tester7%#4 of 15MailReach4%#8 of 15Mid-marketThe figures above
Level: the same share of first choices.
MailReach2%#6 of 19Mail-Tester2%#8 of 19Enterprise
Level: the same share of first choices.
MailReach0%#17 of 17Mail-Tester0%#– of 17What the models said about MailReach
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Five of six in this category shown.
“MailReach helps discover domains and draft outreach, though its verification isn't independently validated.” Muse Glimmer 30B · negative prompt · soft negative
“Often criticized for superficial insights ... followed by heavy upselling” Grok 4.20 · negative prompt · soft negative
“Best Overall Recommendation: MailReach” Claude Haiku 4.5 · paraphrase prompt · first choice
“an email deliverability monitoring and warm-up platform that combines inbox placement testing, domain reputation tracking, and automated warm-up” Claude Haiku 4.5 · comparative prompt · alternative
“MailReach is the alternative when the priority is outbound cold email warm-up + placement bundled together” Muse Glimmer 30B · paraphrase prompt · alternative
What the models said about Mail-Tester
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“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 prompt · soft negative
“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 prompt · soft negative
“Use these only as a diagnostic aid, not as a primary decision-making tool.” DeepSeek V4 Flash · negative prompt · soft negative
“Start with Unspam's free tier or Mail-Tester if you need immediate, low-cost testing.” Kimi K2 · budget prompt · first choice
“Instant spam score (0–10) based on content, authentication, and reputation. No signup needed for basic use.” Grok 4.20 · comparative prompt · alternative
“Cited as a best deliverability testing tool in 2026 with a free spam score, real inbox-placement testing” Muse Glimmer 30B · comparative prompt · alternative
Also compared
GlockApps vs MailReachGlockApps vs Mail-TesterGoogle Postmaster Tools vs MailReachGoogle Postmaster Tools vs Mail-TesterLitmus vs MailReachLitmus vs Mail-TesterZeroBounce vs MailReachZeroBounce vs Mail-TesterMXToolbox vs MailReachMXToolbox vs Mail-TesterMailReach vs Validity EverestValidity Everest vs Mail-TesterAll twenty-eight head-to-head pages and the full email deliverability standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.