The Mailfloss Insider’s Guide
Everything we know about Mailfloss in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Mailfloss
The Insider’s Guide
Email list cleaning that runs inside your email platform
Every plan, grade, refund rule and rival among email verification and deliverability tools, read from Mailfloss’s own pages.
Made by mailfloss · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Mailfloss’s own pages, its app-store listings and our grades. Every fact in it is on Mailfloss’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.2
GPA, above 23 of the 61 other email verification and deliverability tools we grade
Mailfloss is an email verification service that connects to an email marketing platform and checks addresses on a schedule and at signup. It removes or tags bad addresses and fixes common typos in place. Prepaid credits cover one-off CSV uploads, and a REST API is also offered.
To get you started, here are 9 things to know about Mailfloss, taken from its own pages and our grades.
You connect your email platform before it works.
- 1
Best for cleaning an email list inside your email platform
mailfloss checks and cleans the list in your email platform, with a typo fixer and signup checks.
- 2
Paid plans start at $29 a month
As its pricing page puts it: $29 per month for 10,000 credits, billed monthly.
- 3
There is a free plan
500 verifications a month, renewing every month.
- 4
It runs on Web
Web.
- 5
Typo Fixer
Recognizes more than 250 typo patterns in email domains and corrects the address in place instead of deleting the subscriber.
- 6
Signup verification
Instafloss checks each new signup as it arrives and screens out fake, disposable, role-based and dead addresses.
- 7
Daily list cleaning
Autofloss scans new subscribers every day and removes those that fail validation, with custom keep and remove rules.
- 8
A 2.2 GPA, above 23 of 61
That is against the other email verification and deliverability tools we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
To replace Mailfloss you would be making newsletters sent to thousands of people that still reach the inbox. That is not a weekend's work, with an AI app builder or without one.
Mailfloss at a glance
- Pricing
- Free plan, from $29 per month for 10,000 credits, billed monthly
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web
- Made by
- mailfloss
- Category
- Email Verification & Deliverability
- Our grade
- 2.2 GPA, fair
The report card
Best for cleaning an email list inside your email platform
mailfloss checks and cleans the list in your email platform, with a typo fixer and signup checks. The free plan is 500 verifications a month, subscriptions need a supported email platform, and the trial wants a card.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | $29 a month for 10,000 credits, between the email-checker category's middle of $23 and its dearer quarter of $49. |
| Free plan and trial | C | 500 verifications a month, renewing, which is a cap a real list passes. The 7-day trial needs a card. |
| Features | C | Typo fixer, signup checks, daily cleaning and decay protection. But subscription plans need a supported email platform. |
| Ease of use | C | No store rating on record. You connect your email platform before it works. |
| Platforms and integrations | B | Web with Mailchimp, Klaviyo, HubSpot, ActiveCampaign, Kit, Brevo and Zapier links, plus an API. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Mailfloss is for
- Fits if your list lives in Mailchimp, Klaviyo or another platform it plugs into
- Works for lists that need cleaning every day without uploads
Who it is not for
- Tight if you stay free, as 500 verifications a month runs out fast
- Not for you if your platform isn't supported, because you'd use prepaid credits instead
- Watch out: the 7-day trial needs a credit card and the plan starts on day 8
- Pricey if you want more platforms, as Lite connects one and Business ten
Good to know
Good for
- Email marketers who want list cleaning running without exports and re-imports
- Ecommerce stores sending from Klaviyo, Mailchimp or similar platforms
- Small lists, since 500 verifications a month are free
Worth knowing
- Subscription plans need a supported email platform; others must use prepaid credits.
- A credit card is required for the 7-day trial, and the plan starts on day 8.
- Prices on the page are read as monthly; the page offers an annual option that saves 17%.
- Only the entry credit step of each plan shows a price in the page text read here.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$29
A month to start. There is a free plan too
Mailfloss has a free plan. Paid plans start at $29 per month for 10,000 credits, billed monthly.
Lite
$29
per month for 10,000 credits, billed monthly
Connects 1 email platform. Credits step up to 510,000 a month at a higher price; higher steps are not priced on the page.
Business
$59
per month for 25,000 credits, billed monthly
Connects 10 email platforms. Credit steps run up to 525,000 a month at higher prices.
Pro
$209
per month for 125,000 credits, billed monthly
Unlimited email platforms, priority human support and single sign-on. Credit steps run up to 625,000 a month.
The free plan
500 verifications a month, renewing every month.
Read from mailfloss.com on Nov 13, 2026.
Ways to pay less
Annual discount
Save 17% with annual billing
The pricing page has a Monthly/Annual toggle labeled Save 17%. The annual prices were not readable in the page text.
Stated on mailfloss.com
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Email list cleaning that runs inside your email platform. Here is what it does, as its own site describes it, and what it covers: public API, workflow automation, email campaigns, email verification.
Typo fixer, signup checks, daily cleaning and decay protection.
- Typo Fixer
- Recognizes more than 250 typo patterns in email domains and corrects the address in place instead of deleting the subscriber.
- Signup verification
- Instafloss checks each new signup as it arrives and screens out fake, disposable, role-based and dead addresses.
- Daily list cleaning
- Autofloss scans new subscribers every day and removes those that fail validation, with custom keep and remove rules.
- Decay protection
- Re-checks older subscribers on a schedule, since addresses on a list go bad over time.
- Prepaid credits
- For lists outside a supported platform, credits are bought once, never expire, and are used by uploading a file.
- API and Zapier
- Every subscription plan lists a real-time API, webhooks and a Zapier integration.
Where it runs
- Web
What it works with
- Mailchimp
- Klaviyo
- HubSpot
- ActiveCampaign
- Kit
- Brevo
- Zapier
- GetResponse
Mailfloss is made by mailfloss.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
23/61
Other email verification and deliverability tools it is graded above
Mailfloss's GPA of 2.2 is higher than 23 of the 61 other email verification and deliverability tools we grade, and level with 13.
It stands best on platforms and integrations (B, above 28 of 61) and worst on features (C, above 0).
Its paid plans start at $29 a month, against a middle price of $21.50 for the category: 27 of the 43 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4. 7 tools score higher and cost less.
Each grade against the category
Every bar is all 62 email verification and deliverability tools we grade, cut by the letter each got. Mailfloss’s own letter is outlined.
- CValue for moneyAbove 9 of 61
- CFree plan and trialAbove 9 of 61
- CFeaturesAbove 0 of 61
- CEase of useAbove 2 of 61
- BPlatforms and integrationsAbove 28 of 61
Price against what you get
Each dot is one of 45 email verification and deliverability tools. Further left costs less; higher up scores better on features, ease of use and platforms. Mailfloss is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Mailfloss you would be making newsletters sent to thousands of people that still reach the inbox. That is not a weekend's work, with an AI app builder or without one.
It costs $348 a year.
What you could not
- Newsletters sent to thousands of people that still reach the inbox.
- Connections to other products, each kept working as those products change.
- Checking that an address exists without writing to it.
- What a company asks for before it lets staff use something: roles and permissions.
What this rests on. Mailfloss’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Bouncer, ZeroBounce, NeverBounce, Emailable and MillionVerifier
The 5 tools Mailfloss is most often weighed against, with where each one differs from it.
- 2.4GPA
Bouncer
Free trial · from $8 one-time
Email list verification with credits that never expire.
- Mailfloss has a free plan. Bouncer does not, though it has a free trial.
- Mailfloss also covers workflow automation and email campaigns.
- 2.4GPA
ZeroBounce
Free plan · from $39 one-time
Email list verification with warm-up and DMARC monitoring in one plan.
- Only ZeroBounce lists an iOS app.
- Mailfloss also covers workflow automation and email campaigns.
- ZeroBounce also covers inbox warm-up and dMARC.
- 2.4GPA
NeverBounce
Free trial · from $8 one-time
Email list cleaning and real-time verification, now part of ZoomInfo.
- Mailfloss has a free plan. NeverBounce does not, though it has a free trial.
- Mailfloss also covers workflow automation and email campaigns.
- 2.4GPA
Emailable
Free trial · from $38 one-time
Email list verification with inbox reports and blacklist monitoring.
- Mailfloss has a free plan. Emailable does not, though it has a free trial.
- Mailfloss also covers workflow automation and email campaigns.
- 2.4GPA
MillionVerifier
Free trial · from $39 one-time
Low-cost bulk email verification with credits that never expire.
- Mailfloss has a free plan. MillionVerifier does not, though it has a free trial.
- Mailfloss also covers workflow automation and email campaigns.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Mailfloss free?
Mailfloss has a free plan. 500 verifications a month, renewing every month.
How much does Mailfloss cost?
Mailfloss lists 3 plans. Lite: $29 per month for 10,000 credits, billed monthly.
What platforms does Mailfloss work on?
Mailfloss is available on Web.
Does Mailfloss offer any discounts?
Mailfloss publicly lists the following: Save 17% with annual billing.
Does Mailfloss have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Mailfloss is listed for Web.
Does Mailfloss have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Mailfloss is listed for Web.
Is Mailfloss open source?
Mailfloss is not described as open source on its own site, as read on Nov 13, 2026.
Does Mailfloss have an API?
Yes. Mailfloss offers a public API, according to its own site.
What does Mailfloss integrate with?
Mailfloss's listing names Mailchimp, Klaviyo, HubSpot, ActiveCampaign, Kit, Brevo, Zapier and GetResponse.
Who makes Mailfloss?
Mailfloss is made by mailfloss.
What are the alternatives to Mailfloss?
The closest alternatives to Mailfloss in our directory are Bouncer, ZeroBounce, NeverBounce, Emailable and MillionVerifier.
How does Mailfloss compare with other email verification and deliverability tools?
Mailfloss's GPA of 2.2 is higher than 23 of the 61 other email verification and deliverability tools we grade, and level with 13.
Is Mailfloss good value for money?
ToolGPA grades Mailfloss C for value for money. Its paid plans start at $29 a month, against a middle price of $21.50 for the category: 27 of the 43 others that charge start lower.
Could I make my own version of Mailfloss?
To replace Mailfloss you would be making newsletters sent to thousands of people that still reach the inbox.
Where this guide comes from
The prices, plans, platforms and features were read from Mailfloss’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from mailfloss's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by mailfloss. Prices change, so check mailfloss.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Mailfloss, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/mailfloss
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Mailfloss: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/mailfloss
Know someone choosing between email verification and deliverability tools?
Send them this guide: toolgpa.com/tools/mailfloss/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email verification and deliverability tools after Mailfloss, each with an Insider's Guide of its own.
- Email Verification & Deliverability Insider's GuideEvery one of the 63 email verification and deliverability tools we grade, compared
- QuickEmailVerification Insider's GuideBulk email list cleaning and a real-time verification API3.0 GPA
- Mail-Tester Insider's GuideSend an email to a test address and get a spam score out of 102.8 GPA
- Reoon Email Verifier Insider's GuideBulk and real-time email verification with refunds on unknowns2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Mailfloss’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Mailfloss is a trademark of its owner, and this guide is not made, paid for or approved by mailfloss. Prices and plans change: check mailfloss.com before you buy.