Clean & verify bulk emails
on your own computer.

Remove invalid, risky, disposable and catch-all addresses — your list never leaves your machine. One-time license, no monthly SaaS fees, no recurring credits. Built for maximum speed.

Native cross-platform desktop app

Trusted by marketers, agencies & sales teams

NorthGrid

Cobalt&Co

Sendkit

Outpace

Helix Labs

BrightLeaf

A privacy-friendly desktop alternative to SaaS verifiers.

Three reasons people switch from online tools and never look back.

Your list never leaves your computer

No uploads. No third-party servers holding your contacts. Imports, verification, and exports all happen locally — ideal for agencies, sales teams, and anyone handling sensitive client data.

Pay once. Use it forever.

One-time license instead of recurring SaaS fees or credit packs. Predictable cost — verify the same list ten times this month without watching a counter tick down.

Built for maximum speed

Multi-threaded engine that scales to every CPU core. Up to 100 parallel threads on Professional, unlimited on Agency. Verify hundreds of thousands of addresses in a single run.

Bad email addresses quietly destroy campaigns.

Every invalid, disposable, or catch-all contact you send to chips away at deliverability, sender reputation, and your marketing budget — long before you notice the damage.

01 / Bounces

High bounce rates flag you as a spammer

Even a 5% bounce rate is enough for ESPs to throttle your sends. Inbox providers learn to distrust your domain, and reaching real customers gets harder month over month.

02 / Reputation

Sender reputation takes months to repair

Once Gmail, Outlook, or Yahoo route you to spam, getting back is slow. A single dirty campaign can undo a year of careful list-building.

03 / Budget

You pay to reach addresses that don’t exist

ESP pricing is usually per-contact. Disposable, role-based, and undeliverable rows quietly inflate your monthly bill while contributing zero pipeline.

04 / Revenue

Losing revenue without knowing it

Real customers never see your emails — all because low-quality data quietly wrecked your sender reputation.

From messy file to campaign-ready list in five steps.

A guided wizard walks you through import, cleanup, verification, review, and export — without ever leaving your desktop.

--- Step 01 · Import

Drag & drop your list. Map your columns.

Import CSV, TSV, TXT, or Excel files of any size. MailVexa auto-detects email columns and lets you keep every other field — name, company, tags, custom data — straight through to export.

--- Step 02 · Cleanup

Dedupe, trim, normalize — automatically.

Smart rules catch the obvious problems before you waste verification quota: duplicates removed, extra spaces trimmed, addresses normalized to lowercase, role-based and specific domains filtered if you want.

--- Step 03 · Verify

Multi-layer verification. Live progress.

Format → disposable → free-provider → MX → SMTP → mailbox → catch-all → SPF/DMARC. The engine chains checks intelligently, rotates proxies if needed, and shows live progress so you always know what’s happening.

--- Step 04 · Results

Browse, filter, and inspect every result.

Live dashboard with the four categories color-coded, drill-down by sub-reason (catch-all, disposable, role…), per-row detail (MX records, SMTP response), and free-text filter across the whole list.

--- Step 05 · Export

Choose what to export. Send it anywhere.

Pick which result categories to include (Valid, Risky, Invalid, Unknown). Keep all of your original file columns, and optionally add verification-detail columns — status, reason, domain, MX hosts, disposable & free-provider flags, SPF/DMARC — then save as Excel or CSV for Mailchimp, HubSpot, or your CRM.

See the full workflow — import to export — in five minutes.

A five-minute walkthrough of the full wizard — import to export — running natively on macOS.

Built for serious marketers

Multi-threaded engine that scales to your CPU, smart cleanup rules, multi-layer verification, proxy rotation, pause/resume, and flexible export — all built into one desktop app.

Bulk import & smart cleanup

Drag XLSX, XLS, CSV, or TXT. Auto-preview the first 200 rows, pick the email column, dedupe, trim, normalize, and exclude role-based or wildcard domains.

Maximum speed, multi-threaded

The engine scales to every core your CPU can give. Up to 100 parallel threads on Professional, unlimited on Agency — verify hundreds of thousands of addresses without leaving your desk.

Multi-layer verification

Format, disposable, free-provider, MX, SMTP, mailbox, catch-all, and SPF/DMARC — chained intelligently so results stay consistent and reliable.

Proxy pool with rotation

Add HTTP / SOCKS proxies, test them in parallel, rotate every N requests, and cool down failures automatically — so your IP stays unblocked on big jobs.

Real-time dashboard

Watch progress, throughput, and live status as the engine works. A dynamic segment bar shows Valid / Risky / Invalid / Unknown distribution as it forms.

4 result categories

Valid, Risky, Invalid, Unknown — color-coded, with sub-reasons (catch-all, role, disposable…).

Flexible export

Pick exactly which categories (Valid, Risky, Invalid, Unknown) and which columns to include. Export as Excel (.xlsx) or CSV — and start a new job in one click.

Fine-grained engine controls

Threads, per-domain concurrency, retry policy with exponential backoff, STARTTLS, custom MAIL FROM and HELO domain — tune the SMTP probe to match your network.

Smart cleanup

Dedupe, domain-based filter, role-based filter, plus normalization (lowercase + trim) — applied before you spend a single check.

Native on Windows & macOS

A native cross-platform desktop application. DPI-aware on Windows, Apple-silicon-ready on macOS. No browser, no Electron, no install bloat.

Pause, resume & recovery

Pause any job mid-run. Close the app, lose power, change your mind — MailVexa restores state on next launch and picks up exactly where you left off.

Privacy-first by design

Your list never leaves your machine. License keys, proxy credentials, and email content stay local.

Every email lands in one of four buckets.

Built to match how email marketers actually think — so you can decide at a glance which contacts to keep, watch, or drop.

● Valid

Safe to send

Format passes, MX exists, SMTP accepts the recipient. The mailbox is real and accepting mail.

● Risky

Use with caution

Catch-all domains and disposable addresses. May deliver, may not — they hurt long-term reputation.

● Invalid

Don’t send

Bad syntax, missing MX, or the server explicitly rejected the recipient. Guaranteed bounces.

● Unknown

Inconclusive

Server didn’t give a definitive answer or the connection failed. Re-run later or filter conservatively.

Why a desktop app beats a SaaS verifier.

Online verifiers can be useful — but they assume you’re happy uploading client lists and paying every month. MetaLogic MailVexa gives you another option.

Capability

MetaLogic MailVexa

Typical SaaS verifier

Where your list goes

Stays on your computer

Uploaded to their servers

Pricing model

One-time license

Monthly fees + per-credit

Bulk list cleaning

✓

Speed ceiling

Your CPU

Their queue / your plan

Pause / resume / recover

Built-in

Rare

Proxy pool control

Yes — your proxies

Hidden / not exposed

Engine fine-tuning

Threads, retries, STARTTLS, HELO

Often hidden

Long-term cost

Predictable

Scales with volume

Best for

ThreadsPrivacy-focused users, agencies, regular bulk cleanups

Occasional browser-based verifications

One-time license. No credits. No surprises.

Start free for 14 days. Upgrade once. All paid plans include lifetime access to the version you bought, plus updates during the license period.

Trial

Free

14-day evaluation

Up to 2,000 verifications
200 emails per job
Up to 2 active proxies
All verification checks

Test the full workflow before you buy.

Download Trial

Personal

$49

One-time · 1 device

Activate on 1 device
300,000 emails / month
25,000 emails per job
Up to 5 proxies, 25 threads
All verification checks
Updates during license period

Freelancers, solo marketers, bloggers.

Purchase Now!

Professional

$149

One-time · 2 devices

Activate on up to 2 devices
1,000,000 emails / month
100,000 emails per job
Up to 25 proxies, 100 threads
All verification checks
Updates during license period

Small agencies, sales teams, high-volume marketers.

Purchase Now!

Agency

$299

One-time · 5 devices

Activate on up to 5 devices
Unlimited monthly verifications
Unlimited emails per job
Unlimited proxies & threads
All verification checks
Lifetime automatic updates

Large agencies, lead gen, professional services.

Purchase Now!

Earn 40% commission on every license you refer.

Highest payout in the email-verification space. 30-day cookie, $50 minimum payout, paid via Tolt. Founding affiliates also get a 10% bonus for the first 6 months.

40%

Recurring commission

30d

Cookie window

$50

Minimum payout

+10%

Founder bonus

Questions, answered.

Is this a monthly subscription?

No. MetaLogic MailVexa offers one-time license plans. You buy once and own that version of the software, with updates during the license period (lifetime updates on Agency).

Do I need to upload my email list to a server?

No. The software runs on your own computer. Imports, verification, and exports happen locally. Verification does need internet access to perform DNS lookups and SMTP probes — but the list itself never leaves your device.

Can I export only valid emails?

Yes. The Export step lets you pick any combination of Valid, Risky, Invalid, or Unknown — and choose exactly which columns to include (status, reason, domain, MX hosts, free-provider flag, SPF/DMARC, and more). Output is Excel (.xlsx) or CSV.

How fast is the engine, really?

As fast as your CPU and network allow. The multi-threaded engine scales linearly until you hit your bottleneck. Pro supports up to 100 parallel threads; Agency is unlimited. In practice, a 50k list typically completes in 15–25 minutes on a modern laptop.

How accurate are the results?

MailVexa uses the same chained verification approach as top SaaS verifiers (format → disposable → MX → SMTP → mailbox → catch-all). Accuracy depends on the destination provider’s response — for major providers we typically match SaaS-tier accuracy, with the catch-all category honestly flagged rather than guessed.

What if I run into a domain that blocks me?

Add proxies to the proxy pool. MailVexa rotates them automatically and benches the bad ones. The engine also throttles per-domain to stay below thresholds.

Can I get a refund?

Yes. 14-day money-back if it’s not the right fit. The 14-day free trial is meant to make refunds rare, but we honor them.

Ready to clean up your list?

Try the full app for 14 days. Verify up to 2,000 emails. If you don't love it, just delete the app — your data was never anywhere else anyway.

MetaLogic MailVexa is a cross-platform email verification tool that helps you clean, validate, and manage email lists for better deliverability and campaign performance.

Links

Our Policies