Mailfloss logo

Mailfloss

Vendor: Mailfloss

Mailfloss is an automated email verification tool that removes invalid addresses, fixes typos, and improves email deliverability by integrating with 40+ email service providers for continuous list cleaning.

Visit Website ↗
email Email marketers Sales teams using email outreach Businesses managing large email lists Ecommerce email marketers High-growth teams Newsletter publishers #email-verification #deliverability #bounce-reduction #list-cleaning #esp-integration #typo-correction #real-time-verification #automated-list-hygiene

Overview

Mailfloss is an automated email verification platform designed to help businesses maintain clean email lists through continuous, automated verification. It connects directly to 40+ email service providers via OAuth, performing daily list cleaning, real-time signup verification (Instafloss), typo correction (Typo Fixer), and decay protection for aging contacts. The platform offers subscription plans with 7-day free trials and prepaid credits for one-time verification. It integrates natively with major platforms including Klaviyo, HubSpot, ActiveCampaign, Beehiiv, and GoHighLevel, writing verification results directly back to the ESP without CSV round-trips. Mailfloss is used by 5,000+ teams to reduce bounce rates, protect sender reputation, and recover subscribers that other verifiers would delete.

Key Features

Automated Daily List Cleaning (Autofloss)

Runs daily verification against connected email platforms to automatically remove invalid addresses and apply custom keep/remove rules.

Real-time Signup Verification (Instafloss)

Verifies new signups the moment they enter your marketing system, catching bot, disposable, and risky addresses before they reach your list.

Typo Correction (Typo Fixer)

Detects and corrects common email address typos (e.g., gmial.com → gmail.com) to recover potentially valid contacts instead of deleting them.

Decay Protection

Re-verifies older contacts on a schedule to catch addresses that became invalid after initial signup.

Custom Auto-Actions

Allows users to set per-connection rules for handling failed verifications: suppress, delete, tag, update fields, or hold for review.

ESP Integrations (40+ Platforms)

One-click OAuth connections to 40+ email platforms including Mailchimp, Klaviyo, HubSpot, ActiveCampaign, Beehiiv, GoHighLevel, and more — with two-way sync writing results directly back to the ESP.

Real-time API & Webhooks

Provides API access for custom integrations and webhooks for real-time verification events (available on Business and Pro plans).

Prepaid Credits Option

Offers one-time verification credits that never expire for bulk CSV uploads without a subscription.

Pros & Strengths

  • ✓
    Native ESP Integrations with Two-Way Sync: Connects directly via OAuth to 40+ platforms, writing verification results back automatically — no CSV exports, imports, or Zapier required.
  • ✓
    Typo Fixer Recovers Lost Subscribers: Corrects common typos instead of deleting contacts, recovering customers you already paid to acquire (e.g., 563 subscribers/year recovered per typical customer).
  • ✓
    Continuous Autopilot Cleanup: Runs daily without manual intervention, catching list decay continuously rather than requiring periodic bulk verifications.
  • ✓
    7-Day Free Trial on All Subscription Plans: Every subscription tier includes a 7-day free trial to test automated cleanup before committing.
  • ✓
    Flexible Pricing: Subscriptions + Prepaid Credits: Choose recurring subscriptions for continuous cleanup or non-expiring prepaid credits for one-time bulk verification.

Cons & Tradeoffs

  • ⚠
    Subscription Required for Native Integrations: Native ESP connections require a subscription plan; prepaid credits only support CSV uploads without platform integration.
  • ⚠
    Advanced Features Limited to Higher Tiers: Typo Fixer, webhooks, real-time bounce prevention, and multi-platform connections start at Business plan ($59/month) or Pro ($209/month).
  • ⚠
    Volume-Based Pricing Can Scale Quickly: Costs increase significantly with contact volume; Lite plan covers only 10,000 credits/month at $29, Pro at 100,000 credits/month for $209.

Known Limitations

  • • Subscription plans require a supported email service provider; unsupported platforms must use prepaid credits with CSV uploads.
  • • Lite plan limited to 1 email platform connection and 10,000 credits/month.
  • • No free plan available — only 7-day free trial on subscriptions.
  • • Advanced features (Typo Fixer, Instafloss, webhooks, SSO, multi-platform) require Business or Pro tiers.
  • • Pricing is per verification volume, not per seat, which can become costly for high-volume senders.

Pricing & Plans

Model: subscription
USD29 /month

Mailfloss offers three subscription tiers with 7-day free trials: Lite at $29/month for 10,000 credits (1 platform), Business at $59/month for 25,000 credits (10 platforms, Typo Fixer, webhooks, real-time bounce prevention), and Pro at $209/month for 100,000 credits (unlimited platforms, SSO, priority support). Prepaid credits available for one-time CSV verification without subscription, never expire.

✓ Free Plan ✓ Free Trial

Pricing verified: 2026-08-20

Editorial Info

Last Reviewed: 2026-08-20

Verified Sources & Research

Similar Sales Tools

BounceBan

by BounceBan

An email verification service specializing in validating catch-all and Secure Email Gateway (SEG)-protected email addresses with free single verifications and credit-based bulk processing.

freemium

Bounceless

by Bounceless

Bounceless verifies email addresses with Pre-Send Decisions, confidence scores, and reason codes — not just valid/invalid labels — to improve deliverability for email marketing and AI sales agents.

usage

Bouncer

by Bouncer

Bouncer is an email verification and deliverability platform that validates email addresses in real-time and bulk to reduce bounce rates and improve inbox placement.

subscription