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Email deliverability and testing tools · November 2026 Edition

MXToolbox vs MailReach

Zero of fourteen models named MXToolbox first on the direct prompt; zero named MailReach. MXToolbox was named by thirteen of the fourteen models and MailReach by ten and MXToolbox carries 32 labels and MailReach 25, so the shares are not directly comparable.

MXToolbox

accepted challenger

Named in one category this edition.

MailReach

accepted challenger

Named in one category this edition.

First-choice share2%2%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate6%8%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#5#6A position in a field of 19; printed, not drawn.
Labels3225A 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 twelve of the fourteen direct answers. GlockApps vs MXToolbox · GlockApps vs MailReach · 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 modelsMailReach
Direct00
Paraphrase01
Comparative10
Budget-constrained10
Scale-constrained00
Negative102 against MXToolbox · 2 against MailReach
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 November 2026 Edition, MXToolbox and MailReach were named in the same answer twenty-eight times, of the 80 answers naming MXToolbox and the 59 naming MailReach. In those answers MailReach took the first choice one time and MXToolbox three.

Every model, every framing

The eighty-four answers behind the chart above, one cell each: where MXToolbox and MailReach stood in it.
ModelDirectParaphraseComparativeBudget-constrainedScale-constrainedNegative
Claude Haiku 4.5
GPT-5.4 mini
Gemini 3.5 Flash
Perplexity Sonar
Grok 4.20
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 MailReach first choice named as an alternative argued againstblank: not namedEach cell is one answer, MXToolbox on the left and MailReach on the right.

The direct prompt

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

Neither was the first choice, one was named

6 of 14 modelsThe answer put something else first and named one of the two as an alternative.
Claude Haiku 4.5Warmy alternatives: Act-On, GlockApps, MailReach, Mailtrap Email Marketing
Perplexity SonarGlockApps alternatives: EasyDMARC, Google Postmaster Tools, MailReach, Microsoft SNDS, NeverBounce, Validity Everest, ZeroBounce, dmarcian
Llama 4 MaverickGlockApps alternatives: MailReach, Validity Everest
Kimi K2Allegrow alternatives: GlockApps, MailReach
GLM 4.7 FlashXGlockApps alternatives: Allegrow, MailReach
MiniMax M2.5HubSpot Sales Hub, ZeroBounce alternatives: Copper, GlockApps, MXToolbox

Neither was named

8 of 14 modelsThe answer made no first choice from these two in this category.
GPT-5.4 miniLitmus alternatives: Brevo, HubSpot, Salesforce/Marketing Cloud, ZeroBounce
Gemini 3.5 FlashGlockApps alternatives: Folderly, Google Postmaster Tools, Mailgun Optimize, Mailtrap Email Sandbox, Microsoft Smart Network Data Services (SNDS) / Microsoft 365 Admin Insights
Grok 4.20GlockApps alternatives: Allegrow, Validity Everest
Mistral SmallAllegrow, Validity Everest alternatives: Litmus
DeepSeek V4 FlashHubSpot Sales Hub alternatives: GlockApps, Klaviyo, Lemlist, Mailgun, Outreach, Salesloft, SendGrid
Qwen 3.7 FlashGlockApps, ZeroBounce alternatives: Kickbox, NeverBounce, Red Sift OnDMARC, SendForensics, Suped, Validity Everest
GPT-6 LunaGlockApps alternatives: Google Postmaster Tools, Validity Engage
Muse Glimmer 30BGlockApps, MailGenius alternatives: Allegrow, Amplemarket

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 two points.
MXToolbox5%#6 of 15
MailReach4%#8 of 15
The full small business standing →
Mid-marketThe figures above
Level: the same share of first choices.
MXToolbox2%#5 of 19
MailReach2%#6 of 19
The full mid-market standing →
Enterprise
Level: the same share of first choices.
MXToolbox0%#16 of 17
MailReach0%#17 of 17
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. Five of six in this category shown.

“Blocklist-only monitors such as MXToolbox or Heatwave: a clean result does not mean good deliverability” Perplexity Sonar · negative prompt · soft negative
“basic free blocklist checkers (in isolation) ... Over-reliance can give false confidence.” Grok 4.20 · negative prompt · soft negative
“start with Google Postmaster Tools and MXToolbox, which are both free and cover the most common starting points” Claude Haiku 4.5 · budget prompt · first choice
“Use free tools (Google Postmaster, MXToolbox, Microsoft SNDS) for monitoring” MiniMax M2.5 · negative prompt · first choice
“Start with free tools like MXToolbox and Google Postmaster for diagnostics.” Grok 4.20 · comparative prompt · first choice

What the models said about MailReach

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

“MailReach helps discover domains and draft outreach, though its verification isn't independently validated.” Muse Glimmer 30B · negative prompt · soft negative
“Often criticized for superficial insights ... followed by heavy upselling” Grok 4.20 · negative prompt · soft negative
“Best Overall Recommendation: MailReach” Claude Haiku 4.5 · paraphrase prompt · first choice
“an email deliverability monitoring and warm-up platform that combines inbox placement testing, domain reputation tracking, and automated warm-up” Claude Haiku 4.5 · comparative prompt · alternative
“MailReach is the alternative when the priority is outbound cold email warm-up + placement bundled together” Muse Glimmer 30B · paraphrase 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.