Email deliverability and testing tools
Asked as “email deliverability tool”, and as “inbox placement and email testing platform”, on behalf of a mid-market B2B company. 58 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories: how the two compare.
Standing · first-choice share
34%
Contested · Google Postmaster Tools 9%
34GlockApps09Google Postmaster Tools07MailReach50others
34% of first choices, contested.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment; they sit side by side and are never added together.
The standing
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. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrantSince September 2026
02Google Postmaster Tools Lab in the set9%0%30accepted challengernewNew since September 2026: not ranked then, 9% now.
Show the three products at 0%, ordered by negative rate
The floor is 11 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one is noise, and both are shown. Movement is read over the twelve models both editions asked; GPT-6 Luna, Muse Glimmer 30B joined this edition and are in the standing but not yet in the comparison. How the floor is measured
Bars are the share of first choices, 0 to 100Every product with at least 10 labels here. Every product name links to its product page.
Google Postmaster Tools is made by Google, whose model Gemini 3.5 Flash is in the set. On the four share prompts that model made it the first choice one time of 4; the other thirteen models four times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.
All twenty-eight head-to-head pages: the top eight products, each against each
GlockApps vs Mail-TesterGlockApps vs FolderlyGlockApps vs Microsoft SNDSGlockApps vs Validity EverestGoogle Postmaster Tools vs MailReachGoogle Postmaster Tools vs MXToolboxGoogle Postmaster Tools vs Mail-TesterGoogle Postmaster Tools vs FolderlyGoogle Postmaster Tools vs Microsoft SNDSGoogle Postmaster Tools vs Validity EverestMailReach vs MXToolboxMailReach vs Mail-TesterMailReach vs FolderlyMailReach vs Microsoft SNDSMailReach vs Validity EverestMXToolbox vs Mail-TesterMXToolbox vs FolderlyMXToolbox vs Microsoft SNDSMXToolbox vs Validity EverestMail-Tester vs FolderlyMail-Tester vs Microsoft SNDSMail-Tester vs Validity EverestFolderly vs Microsoft SNDSFolderly vs Validity EverestMicrosoft SNDS vs Validity Everest
Recommended versus criticized
Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.
Criticized challengerCriticized default
Negative label rate →
01G02
03
04
05
06M07
08
09
10
11
12Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative50%
Key
01GlockApps34%
GlockApps34%02Google Postmaster Tools9%
03MailReach7%
MailReach7%04MXToolbox5%
MXToolbox5%05Mail-Tester5%
Mail-Tester5%06Folderly3%
Folderly3%07Microsoft SNDS3%
08Validity Everest3%
Validity Everest3%09Mailtrap2%
Mailtrap2%10Email on Acid0%
Email on Acid0%11Litmus0%
Litmus0%12ZeroBounce0%
ZeroBounce0%What they warned about
Three of fourteen models held their first choice under the paraphrase. Claude Haiku 4.5, GPT-5.4 mini, Gemini 3.5 Flash, Perplexity Sonar, Mistral Small, DeepSeek V4 Flash, Llama 4 Maverick, Kimi K2, GLM 4.7 FlashX, MiniMax M2.5 and GPT-6 Luna changed. A high negative share on a product with few labels is a warning. A low share on a product with many labels is salience, not sentiment.
Mail-Tester25%
5 of 20 labels negative · 5 of 14 models · 2 hard negative
“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, negative prompt
Litmus23%
5 of 22 labels negative · 5 of 14 models
“Litmus, for example, positions spam testing as part of QA and blocklist/authentication checks, not a guarantee.” GPT-5.4 mini, negative prompt
Validity Everest26%
7 of 27 labels negative · 5 of 14 models
“its pricing often starts at $20,000 to $65,000/year, making it massive overkill and too expensive for most mid-sized operations” Gemini 3.5 Flash, paraphrase prompt
ZeroBounce25%
5 of 20 labels negative · 4 of 14 models · 1 hard negative
“ZeroBounce only handles the list side of deliverability, not the content or infrastructure side.” Claude Haiku 4.5, negative prompt
What they cite
Citations exist only for the models that return a source list: fourteen of the fourteen in this edition, and all six flagship models on the expanded tier.
Sites the answers cite
79 of 84 answers in this category came back with a source list, from 14 of 14 models: citations where the model returns them, or the search results it consulted. 1059 links across 201 sites, every framing counted. Ranked by the number of answers carrying the site or page. None of the 252 answers across every segment cited this index's own page for the category.
vendor site · Mailtrap35 answers · 41 citations · 12 models
vendor site · Saleshandy27 answers · 32 citations · 10 models
27 answers · 29 citations · 12 models
vendor site · Amplemarket27 answers · 27 citations · 11 models
vendor site · Instantly25 answers · 37 citations · 10 models
vendor site · Guideflow24 answers · 29 citations · 11 models
vendor site · Sender23 answers · 29 citations · 9 models
vendor site · MailReach21 answers · 34 citations · 12 models
vendor site · Prospeo20 answers · 23 citations · 10 models
20 answers · 20 citations · 11 models
19 answers · 21 citations · 11 models
vendor site · Brevo19 answers · 19 citations · 8 models
Pages the answers cite
The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.
26 answers · 11 models
23 answers · 9 models
20 answers · 10 models
20 answers · 11 models
18 answers · 10 models
18 answers · 10 models
18 answers · 9 models
17 answers · 8 models
17 answers · 8 models
17 answers · 7 models
Search against answers
Each company's standing in the answers beside its site's footprint in Google search, one row a site: the products the models named on it with their shares, and the share they add up to; monthly searches on Google, and DataForSEO's estimate of AI search demand (modeled from search signals, directional, not a count of queries to any assistant), for the most-searched of the company's and its products' names (the name is in each row's hover text); estimated monthly organic visits to the site; and its best position in Google's top ten for “best email deliverability tool”, “email deliverability tool”. US estimates from DataForSEO and Google's Ads Transparency Center. A small company's site, or a mid-sized company's site for its flagship, is marked company; a product on a large parent's site (Google, Microsoft) has no site figures. A column with no figures for this category is left out, and an empty cell means none were seen, not none exist. Two measurements side by side: neither is read as the cause of the other.
| Company and products | Share | Own site cited | Name searches, Google | AI search demand, est. | Organic visits | Paid search a month, est. | Google ads, last 30 days | Best Google position |
|---|---|---|---|---|---|---|---|---|
| GlockApps glockapps.com | 34% | 148 | 1,600 | 3 | 8,647 | 1 | ||
| Google parent site Google Postmaster Tools 9% | 9% | 77 | 6,600 | 24 | ||||
| MailReach mailreach.co | 7% | 62 | 1,300 | 5 | 12,483 | 112 | ||
| MXToolbox mxtoolbox.com | 5% | 71 | 60,500 | 126 | 453,570 | 18 | ||
| Mail-Tester mailtester.com | 5% | 51 | 5,400 | 93 | 3,496 | 4 | ||
| Validity validity.com Validity Everest 3%, Validity Engage 2% | 5% | 88 | 140 | 0 | 24,467 company | $264 | 120 | |
| Folderly folderly.com | 3% | 52 | 880 | 11 | 2,464 | 8 | ||
| Microsoft parent site Microsoft SNDS 3% | 3% | 41 | 2,240,000 | 403,136 | ||||
| Yahoo yahoo.com Yahoo Sender Hub 3% | 3% | 13 | ||||||
| Mailtrap mailtrap.io | 2% | 56 | 2,900 | 53 | 84,286 | 1 |
Google's top ten for the two searches hold 17 sites; 0 of them are among the sites the models cited here. The first result for “best email deliverability tool” is devopsschool.com.
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.ShowHide
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.
ShowHideModelDirect“What is the best email deliverability tool for a mid-market B2B company?”Paraphrase“Which inbox placement and email testing platform would you recommend to a mid-sized B2B company?”Comparative“What are the top email deliverability and testing tools and how do they differ?”Budget-constrained“What is the best email deliverability tool for a company with a limited budget?”Scale-constrained“We are a 500 person company evaluating an email deliverability tool. What should we look at?”Negative“Which email deliverability and testing tools should I avoid or be cautious about?”
Claude Haiku 4.5InboxArmy, MailBraceagainst: Validity EverestGlockAppsChangedGlockAppsMailReachno first choiceagainst: Email on Acid, Glock Apps, Litmus, MXToolbox, Mail-Tester, Mailtrap, ZeroBounce
Four alternatives
Folderly, GlockApps, HubSpot, MailsoftlyThree alternatives
Folderly, MailReach, ZeroBounceEight alternatives
Inbox Radar, Litmus, MXToolbox, Mailgun, Mailtrap, PowerDMARC, Validity Everest, ZeroBounceThree alternatives
EmailWarmup, Instantly, PostmarkGPT-5.4 miniMailgun OptimizeValidity EngageChangedGlockAppsWarmup Inboxno first choiceagainst: Litmus
One alternative
GlockAppsOne alternative
LitmusTwo alternatives
Litmus, MailtrapTwo alternatives
GlockApps, WarmyGemini 3.5 FlashAllegrow, GlockAppsagainst: Validity EverestGlockAppsChangedagainst: Litmus, Validity EverestGlockAppsGoogle Postmaster ToolsValidity Everestagainst: SpamAssassin
Two alternatives
Mailgun Optimize, ZeroBounceFour alternatives
Email on Acid, Folderly, Mailtrap, SmartleadEight alternatives
Email on Acid, Litmus, MXToolbox, Mail-Tester, Mailtrap, Validity Everest, Warmforge, Warmy.ioSix alternatives
DeBounce, GlockApps, MXToolbox, Mail-Tester, MailGenius, TrulyInboxSix alternatives
GlockApps, Mailgun Optimize, Mailtrap, Postmark, PowerDMARC, dmarcianPerplexity SonarGlockAppsWarmyChangedno first choiceGoogle Postmaster Tools, MXToolbox, Microsoft SNDS, Yahoo Sender Hubno first choicenothing named
Three alternatives
Amplemarket, MailReach, NeverBounceTwo alternatives
MailReach, Snov.ioTwo alternatives
MailerCheck, TrulyInboxGrok 4.1 FastGlockAppsGlockAppsHeldagainst: Validity EverestGlockAppsGoogle Postmaster Toolsagainst: GlockApps, ZeroBounceno first choiceagainst: Brevo, MXToolbox, Mail-Tester, MailerLite
Three alternatives
MailReach, Validity Everest, Warmy.ioThree alternatives
Email on Acid, Google Postmaster Tools, LitmusFive alternatives
Email on Acid, Litmus, MXToolbox, Mail-Tester, Validity EverestFive alternatives
MXToolbox, Mail-Tester.com, Sender Score, Unspam.email, Warmup InboxSix alternatives
Folderly, GlockApps, MailReach, Mailtrap, Warmy.io, ZeroBounceMistral SmallFolderly, GlockAppsGlockAppsChangedGlockAppsGlockApps, Warmboxno first choiceagainst: MailReach
Two alternatives
MailReach, Zoho CRMTwo alternatives
Mailtrap, Sparkle.ioTwelve alternatives
Folderly, Google Postmaster Tools, MXToolbox, Mail-Tester, MailReach, MailerCheck, MailerSend, Microsoft SNDS, NeverBounce, Validity Everest, Yahoo Sender Hub, ZeroBounceTwo alternatives
MailReach, WarmyDeepSeek V4 FlashMailReachagainst: Folderly, Validity EverestGlockAppsChangedagainst: Litmus, Validity EverestGlockAppsMailercloudagainst: GlockApps, ZeroBounceno first choiceagainst: EasyDMARC, Instantly, Mail-Tester, Mailforge.ai, Mailgun, Reply.io, Smartlead, Unspam.email, Warmup Inbox
Three alternatives
GlockApps, Google Postmaster Tools, MXToolboxFour alternatives
Email on Acid, Google Postmaster Tools, MailReach, Microsoft SNDSTen alternatives
Bouncer, Everest, Folderly, Google Postmaster Tools, MXToolbox, Mail-Tester.com, MailReach, Mailtrap, SendGrid, ZeroBounceFive alternatives
EmailListVerify, Google Postmaster Tools, MXToolbox, MillionVerifier, WarmboxLlama 4 MaverickGlockAppsno first choiceChangedno first choiceMail-Tester, Unspamno first choicenothing named
Three alternatives
Google Postmaster Tools, MailReach, WarmboxQwen 3.7 FlashGlockAppsGlockAppsHeldGlockAppsSenderno first choiceagainst: Instantly Warmup, emailwarmup.com
Six alternatives
250ok, Instantly, Kickbox, Lemlist, Valimail, ZeroBounceTwo alternatives
Folderly, MailReachFour alternatives
Folderly, MXToolbox, Mailtrap, Validity EverestThree alternatives
Brevo, EasyDMARC, Google Postmaster ToolsKimi K2GlockApps, InstantlyGlockAppsChangedGlockAppsGoogle Postmaster Tools, MXToolbox, Mail-Testerno first choiceagainst: Apollo.io, Clearout, Outreach, Salesloft, ZeroBounceagainst: NeverBounce, ZeroBounce
Two alternatives
HubSpot Sales Hub, MailReachFour alternatives
Email on Acid, MailReach, Mailtrap, Validity EverestEight alternatives
Email on Acid, InboxReady, Litmus, Mail-Tester, Mailgun, Mailtrap, SendGrid, Validity EverestThree alternatives
GlockApps, Mailtrap, UnspamGLM 4.7 FlashXGlockApps, MailReachGlockAppsChangedagainst: Validity EverestGlockAppsGoogle Postmaster Tools, MXToolbox, Microsoft SNDS, Yahoo Sender Hubagainst: GlockAppsno first choiceagainst: Mail-Tester
Two alternatives
Folderly, WarmyTwo alternatives
MailReach, MailgunFour alternatives
Mailgun, Mailgun Optimize, Mailtrap, Sparkle.ioNine alternatives
AboutMyEmail, Brevo, EasyDMARC, Mail-Tester, MailReach, Mailgun Optimize, Sender Hub, Sendinblue, UnspamMiniMax M2.5Folderly, Mailtrapagainst: KickboxMailReachChangedGlockAppsEmailListVerifyno first choiceagainst: SpamAssassin
Two alternatives
EasyDMARC, MXToolboxThree alternatives
Amplemarket, GlockApps, Warmy.ioSix alternatives
Folderly, MXToolbox, Mail-Tester, MailReach, Validity Everest, WarmyThree alternatives
Bouncer, DeBounce, ProspeoFive alternatives
Folderly, Litmus, MailerCheck, SendGrid, Spamcheck by PostmarkGPT-6 LunaValidity EverestGlockAppsChangedGlockAppsMail-Testerno first choiceagainst: Litmus
One alternative
GlockAppsOne alternative
LitmusFive alternatives
Email on Acid, Inbox Monster, Litmus, Mailtrap Email Sandbox, Validity EverestTwo alternatives
GlockApps, Google Postmaster ToolsMuse Glimmer 30BGlockAppsGlockAppsHeldGlockAppsMailookno first choiceagainst: GlockApps, MXToolbox, Mail-Tester, MailReach, Mailtrap
Two alternatives
MailReach, Validity EverestSix alternatives
InboxAlly, Instantly, Litmus, MXToolbox, Mailtrap, Validity EverestNine alternatives
Email on Acid, Google Postmaster Tools, InboxReady, Litmus, MXToolbox, Mail-Tester, Microsoft SNDS, SendForensics, Sender ScoreThree alternatives
GetResponse built-in deliverability, Mail-Tester, MailReachBold is the first choiceAlternatives are counted; the count opens them.What the answer argued against
The record
One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency. Full answer text is in the free responses file. Download the record
Eighty-four rows: every prompt, every model, every answer.
| Prompt | Model | Version string | Time (UTC) | Searched | Sources | Latency |
|---|---|---|---|---|---|---|
| Direct recommendation | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:40 | yes | 9 | 8 s |
| Direct recommendation | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:19 | yes | 3 | 5 s |
| Direct recommendation | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 22:21 | yes | 11 | 26 s |
| Direct recommendation | Perplexity Sonar | sonar | 2026-10-05 00:21 | yes | 18 | 3 s |
| Direct recommendation | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:34 | yes | 22 | 9 s |
| Direct recommendation | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 23:11 | yes | 12 | 6 s |
| Direct recommendation | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 22:53 | yes | 20 | 23 s |
| Direct recommendation | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:11 | yes | 5 | 2 s |
| Direct recommendation | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:01 | no | 0 | 25 s |
| Direct recommendation | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:28 | yes | 18 | 26 s |
| Direct recommendation | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:17 | yes | 18 | 67 s |
| Direct recommendation | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:37 | yes | 5 | 19 s |
| Direct recommendation | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:04 | yes | 3 | 14 s |
| Direct recommendation | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 01:00 | yes | 22 | 21 s |
| Paraphrase | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 23:17 | yes | 18 | 9 s |
| Paraphrase | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 01:02 | yes | 2 | 4 s |
| Paraphrase | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:50 | yes | 15 | 24 s |
| Paraphrase | Perplexity Sonar | sonar | 2026-10-05 00:48 | yes | 19 | 2 s |
| Paraphrase | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:55 | yes | 23 | 10 s |
| Paraphrase | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:18 | yes | 14 | 9 s |
| Paraphrase | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:21 | yes | 21 | 34 s |
| Paraphrase | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:19 | yes | 5 | 2 s |
| Paraphrase | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 22:48 | yes | 8 | 26 s |
| Paraphrase | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:34 | yes | 14 | 14 s |
| Paraphrase | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:02 | yes | 23 | 85 s |
| Paraphrase | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:45 | yes | 10 | 30 s |
| Paraphrase | GPT-6 Luna | gpt-6-luna | 2026-10-04 22:45 | yes | 3 | 20 s |
| Paraphrase | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:44 | yes | 13 | 19 s |
| Comparative | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:11 | yes | 9 | 9 s |
| Comparative | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 23:19 | yes | 4 | 7 s |
| Comparative | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:36 | yes | 17 | 28 s |
| Comparative | Perplexity Sonar | sonar | 2026-10-05 00:21 | yes | 19 | 7 s |
| Comparative | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:54 | yes | 20 | 10 s |
| Comparative | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:58 | yes | 9 | 9 s |
| Comparative | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:18 | yes | 24 | 57 s |
| Comparative | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:27 | yes | 5 | 2 s |
| Comparative | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 22:53 | yes | 10 | 37 s |
| Comparative | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:19 | yes | 14 | 25 s |
| Comparative | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-05 00:35 | yes | 22 | 87 s |
| Comparative | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:37 | yes | 13 | 30 s |
| Comparative | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:26 | yes | 9 | 33 s |
| Comparative | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:13 | yes | 14 | 17 s |
| Budget constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:06 | yes | 9 | 8 s |
| Budget constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:43 | yes | 3 | 4 s |
| Budget constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:14 | yes | 6 | 15 s |
| Budget constrained | Perplexity Sonar | sonar | 2026-10-05 00:08 | yes | 20 | 3 s |
| Budget constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:12 | yes | 21 | 9 s |
| Budget constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:41 | yes | 5 | 4 s |
| Budget constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-05 00:21 | yes | 25 | 42 s |
| Budget constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:19 | yes | 5 | 2 s |
| Budget constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:06 | yes | 5 | 18 s |
| Budget constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 22:18 | yes | 10 | 17 s |
| Budget constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-05 00:44 | yes | 25 | 130 s |
| Budget constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:03 | yes | 5 | 22 s |
| Budget constrained | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:34 | yes | 3 | 14 s |
| Budget constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:08 | yes | 21 | 26 s |
| Scale constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 23:11 | no | 0 | 6 s |
| Scale constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:10 | no | 0 | 9 s |
| Scale constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:02 | yes | 11 | 22 s |
| Scale constrained | Perplexity Sonar | sonar | 2026-10-05 00:18 | yes | 20 | 6 s |
| Scale constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 22:12 | yes | 15 | 7 s |
| Scale constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:21 | no | 0 | 7 s |
| Scale constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-05 01:03 | yes | 18 | 44 s |
| Scale constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:35 | yes | 5 | 3 s |
| Scale constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:12 | no | 0 | 26 s |
| Scale constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:14 | yes | 5 | 53 s |
| Scale constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:21 | yes | 19 | 83 s |
| Scale constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-05 00:35 | yes | 5 | 21 s |
| Scale constrained | GPT-6 Luna | gpt-6-luna | 2026-10-04 22:30 | yes | 2 | 19 s |
| Scale constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:46 | yes | 15 | 22 s |
| Negative framing | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 23:43 | yes | 17 | 11 s |
| Negative framing | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:17 | yes | 4 | 6 s |
| Negative framing | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:47 | yes | 19 | 22 s |
| Negative framing | Perplexity Sonar | sonar | 2026-10-05 00:43 | yes | 20 | 3 s |
| Negative framing | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:29 | yes | 24 | 8 s |
| Negative framing | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 23:33 | yes | 5 | 5 s |
| Negative framing | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 22:20 | yes | 25 | 47 s |
| Negative framing | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:56 | yes | 5 | 2 s |
| Negative framing | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:20 | yes | 19 | 38 s |
| Negative framing | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:31 | yes | 25 | 18 s |
| Negative framing | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:40 | yes | 25 | 102 s |
| Negative framing | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-05 00:26 | yes | 20 | 70 s |
| Negative framing | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:40 | yes | 5 | 22 s |
| Negative framing | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:35 | yes | 25 | 31 s |
Normalization in this category
Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.
ShowHide
Category-scoped readings
Validity read as Validity Everest
Validity (Everest) read as Validity Everest
Validity (InboxReady) read as Validity Everest
Unresolved, counted raw
AboutMyEmail
Email Tool Tester
GetResponse built-in deliverability
GlacierApps
Glock Apps
GlockApps Warm‑up
Hunter Sequences
Instantly Warmup
MailBrace
Mailercloud Email Verifier
Mailforge.ai
OnDMARC
Red Sift
SMTP.com Reputation Defense
SURBL
Salesforce (Einstein)
Spamcheck by Postmark
Spamhaus
URIBL
emailwarmup.com
Discontinued, still offered
No shut-down product was recommended here.