Your email list, cleaning itself.
mailfloss is an email verification service that runs on autopilot inside your email platform. Four products work together: typos get fixed, bad signups get blocked, your list gets cleaned daily, and decayed subscribers get caught — without you lifting a finger.
Pick what you need. They all work together.
Catch the typos every other tool just deletes.
Most verification services see [email protected], mark it invalid, and trash it. mailfloss recognizes the pattern, fixes the domain, and keeps the subscriber on your list — across every other autopilot product.
- Recognizes 250+ typo patterns across every major email domain
- Saves real subscribers your competitors would silently lose
- Layers on top of Instafloss, Autofloss, and decay protection
Block the bot signups, fakes, and disposable emails the moment they hit your form.
After you connect your email platform, Instafloss verifies every new signup the moment it lands — stopping the bot and spam signups, fakes, disposables, role accounts, and dead domains before they ever pollute your list. (For verification on opt-in forms, see our JS form widget.)
- One toggle in your mailfloss dashboard — zero code
- Stops bot & spam signups, fakes, disposables, role accounts
- Runs the instant a new subscriber joins — no waiting
Yesterday’s new subscribers, validated by morning.
Can’t add a JavaScript snippet? Autofloss runs once a day, scanning every new subscriber from the last 24 hours and removing anything that didn’t survive validation.
- Runs every day on autopilot
- Perfect for forms you can’t modify
- Catches everything Instafloss would — just 24h later
Your 5-year-old subscribers, re-validated on a schedule.
Subscribers go stale. Inboxes get abandoned, jobs change, domains expire. decay protection sweeps your entire list periodically and quietly removes addresses that have rotted since they joined.
- Set the cadence — anywhere from weekly to once every six months (monthly by default)
- Catches address decay your other tools miss
- Protects your sender reputation long-term
When each one runs.
mailfloss is a layered system. Here’s where each product fits in your subscriber’s journey.
Not on a supported platform? Building something? mailfloss meets you where you are.
mailfloss is most powerful when connected to your email platform, but it works just as well as a standalone verifier, a developer API, or anywhere in between.
Email platform integrations
One-click connect into Mailchimp, Klaviyo, HubSpot, ActiveCampaign, and 35+ others. Daily auto-cleanup, real-time signup blocker, decay protection — all on autopilot.
Upload a CSV
Drag and drop a list of any size. mailfloss returns a clean file in minutes. Pay per credit — no subscription required.
Copy & paste
Paste 1 or 100,000 addresses directly into the mailfloss dashboard. Results stream back as we work.
Google Sheets
Verify emails right inside Google Sheets with our extension. Cells get a green check, red x, or fixed-typo result — in place.
Airtable
Same idea, inside Airtable. Add a verification field to any table and watch the rows clean themselves.
Zapier
Verify any email in any workflow. Filter out bad addresses before they hit your CRM, your support tool, or your billing system.
JS form widget
Drop a JavaScript snippet on any opt-in form. Blocks typos, fakes, and disposables before the form submits. Separate from Instafloss — use it when you can’t (or don’t want to) route signups through your email platform first.
Webhooks
Get notified when mailfloss verifies, fixes, or removes an address. Wire it into anything — Slack, your data warehouse, your CRM.
Verification API
Programmatic single-email verification + bulk endpoints. The same engine that powers everything else, exposed as REST. Built for AI agents and product integrations.
Common questions.
What's the Typo Fixer worth to you?
When [email protected] signs up, other verifiers mark it invalid and delete it. mailfloss fixes the typo and keeps the customer you already paid to acquire.