GTM AI Index

Index › Products › MailerCheck · October 2026 Edition

2 categories · Named, not ranked

MailerCheck

19Judge labels

1First choices

1Negative labels

10 / 14Models named it

2Categories

October 2026 Edition. Every number here is derived from the raw labels under vendor table v2026-10-05.2, every buyer segment counted.

Standing

7 labels, too few to rank

A product needs 10 labels in a category before a share or quadrant is stated. MailerCheck was named 7 times in Email deliverability and 1 other category, where GlockApps led with 34%. The labels and the evidence are below, counted exactly.

By buyer segmentRead the same way at every buyer size.

Small business13 of 114

under the label threshold

Mid-market31 of 110

under the label threshold

Enterprisenot named

No model named it for this buyer.

In email deliverability · each standing computed within its segment · bars are 0 to 100 · the accent bar is the product's own best reading

Standing by category

Every category where a model named MailerCheck for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant	Since September 2026
Email deliverability and testing tools	Marketing	0%	31 of 110	0%	4	under 10 labels · led by GlockApps at 34%
Email verification	GTM data and infrastructure	0%	18 of 65	0%	3	under 10 labels · led by ZeroBounce at 42%	=heldSince September 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise. Read over the models both editions asked.

Movement

This is the first edition on this tier, so no move can be computed for MailerCheck yet. From the next edition this section shows, per buyer segment and per category, whether its share moved by more than the measured noise floor.

By model

How each model treated MailerCheck across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.

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Model	Alternative	Labels
Claude Haiku 4.5	0	0
GPT-5.4 mini	0	0
Gemini 3.5 Flash	2	2
Perplexity Sonar	1	1
Grok 4.20	0	0
Mistral Small	2	2
DeepSeek V4 Flash	0	0
Llama 4 Maverick	0	0
Qwen 3.7 Flash	0	0
Kimi K2	0	0
GLM 4.7 FlashX	1	1
MiniMax M2.5	1	1
GPT-6 Luna	0	0
Muse Glimmer 30B	0	0

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct2 labels1

Paraphrase1 labelNone

Comparative10 labels3not counted in share

Budget-constrained2 labelsNone

Scale-constrained2 labelsNone

Negative2 labelsNone

First choiceAlternativeMentionNegative19 labels in all, every segment counted; 1 of the 4 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“Best low-cost all-around paid option: Mailercheck at $7/month” Perplexity Sonar · Email deliverability · budget prompt · alternative

“MailerCheck: ... 1,000 free monthly credits that reset every month” Gemini 3.5 Flash · Email verification · budget prompt · alternative

“MailerCheck | List hygiene, small-to-mid-size businesses” MiniMax M2.5 · Email deliverability · scale prompt · alternative

“Primary Use: Content testing and list health insights.” Mistral Small · Email deliverability · comparative prompt · alternative

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

No model argued against it.

Named alongside

The products named in the same answers as MailerCheck, over the 19 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and MailerCheck was named but was not.

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ProductSame answerTook the first choice insteadHead to head

NeverBounce12 of 192Not among the top eight

ZeroBounce11 of 192Not among the top eight

GlockApps8 of 195Not among the top eight

Google Postmaster Tools7 of 192Not among the top eight

Folderly7 of 190Not among the top eight

Microsoft SNDS6 of 192Not among the top eight

Hunter Email Verifier6 of 190Not among the top eight

Litmus6 of 190Not among the top eight

Emailable5 of 191Not among the top eight

MXToolbox5 of 191Not among the top eight

A head-to-head page exists where both products are among a category's top eight. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named MailerCheck. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 19 of the 19 answers that named MailerCheck and are not a share of its labels.

Domains cited

mailercheck.comYour site12

emailtooltester.com7

folderly.com7

guideflow.com7

mailtrap.io7

myemailverifier.com6

hunter.io5

omnisend.com5

smtp.com5

amplemarket.com4

Fifty-three of the sixty-five domain citations in answers naming MailerCheck came from somebody else's page.

Pages cited

mailercheck.com/articles/best-email-deliverability-tools10

folderly.com/blog/email-deliverability-tools6

myemailverifier.com/blog/email-deliverability-tools6

emailtooltester.com/en/blog/best-email-deliverability-tools5

guideflow.com/blog/email-testing-software5

hunter.io/email-verification-guide/best-email-verifiers5

omnisend.com/blog/email-deliverability-tools5

smtp.com/blog/transactional-email/best-email-deliverability-tools5

Pages are listed as the models cited them.

What it publishes

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Addresses on mailercheck.com

108

subdomains included

Content

counted in the table below

Documentation

Product · Integration

5 · 0

Kind	Pages	Latest	Categories named
Blog	36	2026-04-13	Email verification
Comparison	9	2021-08-12
Template or tool	1	2023-12-20

Most recent

2026-04-13Best email deliverability tools blog
2026-03-17Best dmarc analyzer tools blog
2026-02-25Mailchimp competitors blog
2026-01-21Improve your deliverability with inbox insights blog
2025-12-17Transactional email mcp server blog
2025-11-19Email validation using python blog

How it is countedHide how it is counted

Every page mailercheck.com exposes, subdomains included. Kind is read from the address and title. The last 90 days, the latest date and the twelve months count pages by when they were published, from the site's feeds, a date in the address, or the page's own publication date, read from up to a hundred of its most recently changed pages; a page that says only when it last changed is counted in its kind but not in when, so the recent counts are a floor, and a kind none of whose pages gives a publication date reads undated. Read September 29, 2026.

Names read as MailerCheck

What the judge wrote, as written, with how often. The vendor table decides that these count as MailerCheck; a claim can dispute any of them.

Mailercheck 1

Follow MailerCheck

An email the morning each edition publishes: where this product moved, where it held, and by how much against the noise floor. One address, confirmed by a click; a stop link in every email.

Already following? Everything you follow, with a stop for each.

The company

MailerCheck is its own company.

ShowHide

In its own words

Stated by the vendor, not checked

Positioning: Email list verification and deliverability testing tool
mailercheck.com
For: How many credits do you need?
mailercheck.com/pricing
Price stated: Pay as you go $ 10.00 1,000 credits $ 0.01 per credit mailercheck.com
Starting price: $ 10.00 mailercheck.com
Free plan or trial: Sign up free And receive 10 free credits to get started mailercheck.com
Integrations claimed: 7 mailercheck.com/help/integrations
Certifications: GDPR Compliant
Customers named: Papercup
Not stated on the pages read: Hosting

What MailerCheck's own pages state, read October 5, 2026: mailercheck.com, mailercheck.com/pricing, mailercheck.com/features/usage-reports, mailercheck.com/help/integrations. A claimed page can correct any of them.

Is this your product?

Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when MailerCheck's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as MailerCheck, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

What a new claim receivesHide what a new claim receives

A new claim receives the current edition's vendor brief for MailerCheck by email, built from the raw record of the edition. It shows:

where MailerCheck is named, by buyer and by framing, and which cells hold its first choices;
the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
its vocabulary against the segment leader's, and the pages the models cited;
who was chosen in the answers that did not name MailerCheck, and every reason the record gives;
a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
one page of published figures cleared to show a buyer.