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Email deliverability and testing tools · October 2026 Edition

MXToolbox vs Folderly

Zero of fourteen models named MXToolbox first on the direct prompt; two named Folderly. MXToolbox was named by twelve of the fourteen models and Folderly by eleven and MXToolbox carries 31 labels and Folderly 20, so the shares are not directly comparable.

MXToolbox

accepted challenger

Named in two categories this edition.

Folderly

accepted challenger

Named in one category this edition.

First-choice share5%3%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate10%5%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#4#6A position in a field of 12; printed, not drawn.
Labels3120A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, MXToolbox 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 MXToolbox · GlockApps vs Folderly · Google Postmaster Tools vs MXToolbox

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.
MXToolboxFirst choices, of fourteen modelsFolderly
Direct021 against Folderly
Paraphrase00
Comparative00
Budget-constrained30
Scale-constrained00
Negative003 against MXToolbox
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, MXToolbox and Folderly were named in the same answer twenty-five times, of the 72 answers naming MXToolbox and the 52 naming Folderly. In those answers Folderly took the first choice three times and MXToolbox three.

Every model, every framing

The eighty-four answers behind the chart above, one cell each: where MXToolbox and Folderly stood in it.
ModelDirectParaphraseComparativeBudget-constrainedScale-constrainedNegative
Claude Haiku 4.5
GPT-5.4 mini
Gemini 3.5 Flash
Perplexity Sonar
Grok 4.1 Fast
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
MXToolbox Folderly first choice named as an alternative argued againstblank: not namedEach cell is one answer, MXToolbox on the left and Folderly on the right.

The direct prompt

The plain question, one answer per model, grouped by where MXToolbox and Folderly stood in it.

Folderly first, MXToolbox an alternative

2 of 14 modelsMXToolbox was named in the answer but not as the choice, or not at all.
Mistral SmallFolderly, GlockApps alternatives: MailReach, Zoho CRM
MiniMax M2.5Folderly, Mailtrap alternatives: EasyDMARC, MXToolbox

Neither was the first choice, one was named

3 of 14 modelsThe answer put something else first and named one of the two as an alternative.
Claude Haiku 4.5InboxArmy, MailBrace alternatives: Folderly, GlockApps, HubSpot, Mailsoftly
DeepSeek V4 FlashMailReach alternatives: GlockApps, Google Postmaster Tools, MXToolbox
GLM 4.7 FlashXGlockApps, MailReach alternatives: Folderly, Warmy

Neither was named

9 of 14 modelsThe answer made no first choice from these two in this category.
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
Llama 4 MaverickGlockApps
Qwen 3.7 FlashGlockApps alternatives: 250ok, Instantly, Kickbox, Lemlist, Valimail, ZeroBounce
Kimi K2GlockApps, Instantly alternatives: HubSpot Sales Hub, MailReach
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
MXToolbox leads by five points.
MXToolbox6%#3 of 15
Folderly2%#13 of 15
The full small business standing →
Mid-marketThe figures above
MXToolbox leads by two points.
MXToolbox5%#4 of 12
Folderly3%#6 of 12
The full mid-market standing →
Enterprise
The order flips: Folderly leads at enterprise.
Folderly2%#6 of 14
MXToolbox0%#14 of 14
The full enterprise standing →

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

What the models said about Folderly

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of five in this category shown.

“Overpriced for most mid-market teams — many reviewers suggest MailReach as a better-value alternative.” DeepSeek V4 Flash · direct prompt · soft negative
“Folderly and GlockApps are top choices due to their comprehensive features and strong reputations” Mistral Small · direct prompt · first choice
“Folderly or Mailtrap would be the top choices.” MiniMax M2.5 · direct prompt · first choice
“Built specifically for B2B sales teams and lead-generation agencies running cold-email campaigns at scale” Claude Haiku 4.5 · direct prompt · alternative
Also compared

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.