Email deliverability and testing tools · October 2026 Edition
Microsoft SNDS vs Validity Everest
Zero of fourteen models named Microsoft SNDS first on the direct prompt; one named Validity Everest. Microsoft SNDS was named by ten of the fourteen models and Validity Everest by twelve and Microsoft SNDS carries 15 labels and Validity Everest 27, so the shares are not directly comparable.
Microsoft SNDS
accepted challengerBy Microsoft, Vancouver, Canada, founded 1975. Named in one category this edition.
Named in one category this edition.
First-choice share3%3%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate0%26%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#7#8A position in a field of 12; printed, not drawn.
Labels1527A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Microsoft SNDS reading right to left. Rank and label count are printed, not drawn.GlockApps was named alongside these two in thirteen of the fourteen direct answers. GlockApps vs Microsoft SNDS · GlockApps vs Validity Everest · Google Postmaster Tools vs Microsoft SNDS
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.
Microsoft SNDSFirst choices, of fourteen modelsValidity Everest
Direct013 against Validity Everest
Paraphrase004 against Validity Everest
Comparative00
Budget-constrained20
Scale-constrained01
Negative10
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.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Microsoft SNDS and Validity Everest stood in it.
| Model | DirectMS | ParaphraseMS | ComparativeMS | Budget-constrainedMS | Scale-constrainedMS | NegativeMS |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | ||||
| GPT-5.4 mini | ||||||
| Gemini 3.5 Flash | | | | | MS | |
| Perplexity Sonar | MS | |||||
| Grok 4.1 Fast | | | | MS | ||
| Mistral Small | MS | |||||
| DeepSeek V4 Flash | | MS | MS | |||
| Llama 4 Maverick | ||||||
| Qwen 3.7 Flash | | MS | ||||
| Kimi K2 | | | ||||
| GLM 4.7 FlashX | | MS | ||||
| MiniMax M2.5 | | |||||
| GPT-6 Luna | | | ||||
| Muse Glimmer 30B | | | MS |
MS Microsoft SNDS Validity EverestMS first choiceMS named as an alternativeMS argued againstblank: not namedEach cell is one answer, Microsoft SNDS on the left and Validity Everest on the right.
Validity EverestMS first choiceMS named as an alternativeMS argued againstblank: not namedEach cell is one answer, Microsoft SNDS on the left and Validity Everest on the right.The direct prompt
The plain question, one answer per model, grouped by where Microsoft SNDS and Validity Everest stood in it.
Validity Everest first, Microsoft SNDS not the choice
1 of 14 modelsMicrosoft SNDS was named in the answer but not as the choice, or not at all.GPT-6 LunaValidity Everest alternatives: GlockApps
Neither was the first choice, one was named
2 of 14 modelsThe answer put something else first and named one of the two as an alternative.Grok 4.1 FastGlockApps alternatives: MailReach, Validity Everest, Warmy.io
Muse Glimmer 30BGlockApps alternatives: MailReach, Validity Everest
Neither was named
11 of 14 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5InboxArmy, MailBrace alternatives: Folderly, GlockApps, HubSpot, Mailsoftly
GPT-5.4 miniMailgun Optimize alternatives: GlockApps
Gemini 3.5 FlashAllegrow, GlockApps alternatives: Mailgun Optimize, ZeroBounce
Perplexity SonarGlockApps alternatives: Amplemarket, MailReach, NeverBounce
Mistral SmallFolderly, GlockApps alternatives: MailReach, Zoho CRM
DeepSeek V4 FlashMailReach alternatives: GlockApps, Google Postmaster Tools, MXToolbox
Llama 4 MaverickGlockApps
Qwen 3.7 FlashGlockApps alternatives: 250ok, Instantly, Kickbox, Lemlist, Valimail, ZeroBounce
Kimi K2GlockApps, Instantly alternatives: HubSpot Sales Hub, MailReach
GLM 4.7 FlashXGlockApps, MailReach alternatives: Folderly, Warmy
MiniMax M2.5Folderly, Mailtrap alternatives: EasyDMARC, MXToolbox
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
Microsoft SNDS leads by three points.
Microsoft SNDS3%#9 of 15
Validity Everest0%#15 of 15Mid-marketThe figures above
Level: the same share of first choices.
Microsoft SNDS3%#7 of 12
Validity Everest3%#8 of 12Enterprise
The order flips: Validity Everest leads at enterprise.
Validity Everest45%#1 of 14Microsoft SNDS0%#11 of 14
The full enterprise standing →What the models said about Microsoft SNDS
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.
“Set up Google Postmaster Tools (free) and Microsoft SNDS (free). These are the only tools that provide direct, unvarnished reputation data” Gemini 3.5 Flash · negative prompt · first choice
“Best free option: Stack Google Postmaster Tools, Microsoft SNDS, Yahoo Sender Hub, MXToolbox, Mail Tester, AboutMyEmail, and Sender Hub.” GLM 4.7 FlashX · budget prompt · first choice
“free monitoring stack with Google Postmaster Tools, Microsoft SNDS, MXToolbox, and Yahoo Sender Hub” Perplexity Sonar · budget prompt · first choice
What the models said about Validity Everest
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“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 · soft negative
“enterprise suites like *Validity Everest* (which can cost upward of $15,000/year) to be too complex and cost-prohibitive” Gemini 3.5 Flash · direct prompt · soft negative
“The gold standard for enterprise, but likely overkill for mid-sized companies on both features and budget.” DeepSeek V4 Flash · paraphrase prompt · soft negative
“The gold standard for larger mid-market and enterprise brands. Extremely deep seed-testing network and comprehensive reputation monitoring, though highly priced.” Gemini 3.5 Flash · scale prompt · first choice
“My default pick: Validity Everest” GPT-6 Luna · direct prompt · first choice
“Everest is the largest and most robust platform in the space... generally cost-prohibitive for SMBs.” Gemini 3.5 Flash · comparative prompt · alternative
Also compared
GlockApps vs Microsoft SNDSGlockApps vs Validity EverestGoogle Postmaster Tools vs Microsoft SNDSGoogle Postmaster Tools vs Validity EverestMailReach vs Microsoft SNDSMailReach vs Validity EverestMXToolbox vs Microsoft SNDSMXToolbox vs Validity EverestMail-Tester vs Microsoft SNDSMail-Tester vs Validity EverestFolderly vs Microsoft SNDSFolderly vs Validity EverestAll 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.