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Email deliverability and testing tools · October 2026 Edition

Google Postmaster Tools vs Microsoft SNDS

Zero of fourteen models named Google Postmaster Tools first on the direct prompt; zero named Microsoft SNDS. Google Postmaster Tools was named by thirteen of the fourteen models and Microsoft SNDS by ten and Google Postmaster Tools carries 30 labels and Microsoft SNDS 15, so the shares are not directly comparable.

Google Postmaster Tools

accepted challenger

By Google, Mountain View, California, United States, founded 1998. Named in one category this edition.

Microsoft SNDS

accepted challenger

By Microsoft, Vancouver, Canada, founded 1975. Named in one category this edition.

First-choice share9%3%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate0%0%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#2#7A position in a field of 12; printed, not drawn.
Labels3015A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Google Postmaster Tools 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 Google Postmaster Tools · GlockApps vs Microsoft SNDS · 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.
Google Postmaster ToolsFirst choices, of fourteen modelsMicrosoft SNDS
Direct00
Paraphrase00
Comparative00
Budget-constrained52
Scale-constrained00
Negative21
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 October 2026 Edition, Google Postmaster Tools and Microsoft SNDS were named in the same answer thirty-nine times, of the 77 answers naming Google Postmaster Tools and the 41 naming Microsoft SNDS. In those answers Microsoft SNDS took the first choice zero times and Google Postmaster Tools seven.

Every model, every framing

The eighty-four answers behind the chart above, one cell each: where Google Postmaster Tools and Microsoft SNDS stood in it.
ModelDirectGPMSParaphraseGPMSComparativeGPMSBudget-constrainedGPMSScale-constrainedGPMSNegativeGPMS
Claude Haiku 4.5
GPT-5.4 mini
Gemini 3.5 FlashGPGPMS
Perplexity SonarGPMS
Grok 4.1 FastGPGPGPMS
Mistral SmallGPMSGP
DeepSeek V4 FlashGPGPMSGPGPGPMS
Llama 4 MaverickGP
Qwen 3.7 FlashGPGPMS
Kimi K2GPGP
GLM 4.7 FlashXGPMS
MiniMax M2.5GP
GPT-6 LunaGP
Muse Glimmer 30BGPMS
GP Google Postmaster ToolsMS Microsoft SNDSGP first choiceGP named as an alternativeGP argued againstblank: not namedEach cell is one answer, Google Postmaster Tools on the left and Microsoft SNDS on the right.

The direct prompt

The plain question, one answer per model, grouped by where Google Postmaster Tools and Microsoft SNDS stood in it.

Neither was the first choice, one was named

1 of 14 modelsThe answer put something else first and named one of the two as an alternative.
DeepSeek V4 FlashMailReach alternatives: GlockApps, Google Postmaster Tools, MXToolbox

Neither was named

13 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
Grok 4.1 FastGlockApps alternatives: MailReach, Validity Everest, Warmy.io
Mistral SmallFolderly, GlockApps alternatives: MailReach, Zoho CRM
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
GPT-6 LunaValidity Everest alternatives: GlockApps
Muse Glimmer 30BGlockApps alternatives: MailReach, Validity Everest

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
Google Postmaster Tools leads by six points.
Google Postmaster Tools10%#2 of 15
Microsoft SNDS3%#9 of 15
The full small business standing →
Mid-marketThe figures above
Google Postmaster Tools leads by five points.
Google Postmaster Tools9%#2 of 12
Microsoft SNDS3%#7 of 12
The full mid-market standing →
Enterprise
Level: the same share of first choices.
Google Postmaster Tools0%#9 of 14
Microsoft SNDS0%#11 of 14
The full enterprise standing →

What the models said about Google Postmaster Tools

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
“Best overall for near-zero budget: 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 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
Also compared
GlockApps vs Google Postmaster ToolsGlockApps vs Microsoft SNDSGoogle Postmaster Tools vs MailReachGoogle Postmaster Tools vs MXToolboxGoogle Postmaster Tools vs Mail-TesterGoogle Postmaster Tools vs FolderlyGoogle Postmaster Tools vs Validity EverestMailReach vs Microsoft SNDSMXToolbox vs Microsoft SNDSMail-Tester vs Microsoft SNDSFolderly vs Microsoft SNDSMicrosoft SNDS 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.