Google Postmaster Tools vs MXToolbox
Zero of fourteen models named Google Postmaster Tools first on the direct prompt; zero named MXToolbox. Google Postmaster Tools was named by thirteen of the fourteen models and MXToolbox by twelve and Google Postmaster Tools carries 30 labels and MXToolbox 31, so the shares are not directly comparable.
Google Postmaster Tools
accepted challengerBy Google, Mountain View, California, United States, founded 1998. Named in one category this edition.
Named in two categories this edition.
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
Across every category in the October 2026 Edition, Google Postmaster Tools and MXToolbox were named in the same answer forty-four times, of the 77 answers naming Google Postmaster Tools and the 72 naming MXToolbox. In those answers MXToolbox took the first choice zero times and Google Postmaster Tools five.
Every model, every framing
| Model | DirectGP | ParaphraseGP | ComparativeGP | Budget-constrainedGP | Scale-constrainedGP | NegativeGP |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | ||||
| GPT-5.4 mini | ||||||
| Gemini 3.5 Flash | | GP | GP | |||
| Perplexity Sonar | GP | |||||
| Grok 4.1 Fast | GP | | GP | GP | ||
| Mistral Small | GP | GP | ||||
| DeepSeek V4 Flash | GP | GP | GP | GP | GP | |
| Llama 4 Maverick | GP | |||||
| Qwen 3.7 Flash | | GP | GP | |||
| Kimi K2 | GP | GP | ||||
| GLM 4.7 FlashX | GP | |||||
| MiniMax M2.5 | | | GP | |||
| GPT-6 Luna | GP | |||||
| Muse Glimmer 30B | | GP | |
MXToolboxGP first choiceGP named as an alternativeGP argued againstblank: not namedEach cell is one answer, Google Postmaster Tools on the left and MXToolbox on the right.The direct prompt
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.Neither was named
12 of 14 modelsThe answer made no first choice from these two in this category.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
MXToolbox6%#3 of 15MXToolbox5%#4 of 12MXToolbox0%#14 of 14What 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 MXToolbox
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of seven in this category shown.
“MxToolbox is an infrastructure diagnostic tool, not a campaign email testing tool... best used only for specific DNS and infrastructure checks, not comprehensive campaign testing.” Claude Haiku 4.5 · negative prompt · hard negative
“Free tools like Mail Tester and MxToolbox handle basic checks but lack the depth for production workflows.” Muse Glimmer 30B · negative prompt · soft negative
“lack depth for production-scale testing, inbox placement simulation, or ongoing monitoring” Grok 4.1 Fast · negative prompt · soft negative
“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
“Start with free tools → Google Postmaster Tools + MXToolbox + Mail-Tester free tier” Kimi K2 · budget prompt · first choice
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.