Knowledge Base

Knowledge Base

Knowledge Base

Using and Understanding your mailfloss Dashboard

Category Definitions

Status Definitions

mailfloss Recommended Settings

Which failed email addresses should I delete from my list?

What is the recommended procedure for dealing with Accept All email addresses?

What browsers work best with the mailfloss app?

How to enable Two Factor Authentication (2fa)

How to activate cached results for flossing

What's a false negative and why is it a risk?

What's a false positive and why is it a risk?

What is email bounce rate?

Acceptable bounce rate

Verification options for non-supported ESPs

Understanding the Risks of Email Verification

Understanding the Risks of Sending to Old Email Lists

Passkeys: A Faster and More Secure Way to Sign In to mailfloss

Frequently Asked Questions

Is mailfloss a real-time email verifier?

What's the difference between Autofloss and Instafloss and what are the pros and cons of each?

Does mailfloss detect and handle spam bots?

Are duplicate email addresses removed?

How are you different from X (some email verification services)?

How fast is mailfloss?

How accurate is mailfloss?

Can you bypass MailChimp's Omnivore?

Do you offer Single Sign On authentication (SSO)?

About the Option of Pausing Your Subscription for 3 Months

How to Update Your Account Information

Future Integrations: What's Next for mailfloss?

How to connect an email service provider

How to connect Attentive to mailfloss

How to connect Ortto to mailfloss

Connect an Email Service Provider

Why can't I register/integrate with my desired email provider?

How to connect Encharge to mailfloss

How to connect GoHighLevel to mailfloss

How to connect Ghost to mailfloss

How to connect Beehiiv to mailfloss

How to connect Mailerlite to mailfloss

How to connect ClickFunnels to mailfloss

How to connect ActiveCampaign to mailfloss

How to connect AWeber to mailfloss

How to connect Campaign Monitor to mailfloss

How to connect Constant Contact to mailfloss

How to connect Kit to mailfloss

How to connect Keap (formerly Infusionsoft) to mailfloss

How to connect Ontraport to mailfloss

How to connect MailChimp to mailfloss

How to connect Sendlane to mailfloss

How to connect Klaviyo to mailfloss

How to connect Brevo to mailfloss

How to connect MailerLite Classic to mailfloss

How to connect Moosend to mailfloss

How to connect Gist to mailfloss

How to connect HubSpot to mailfloss - Oauth

How to connect Drip to mailfloss - Oauth

How to connect Intercom to mailfloss

How to connect GetResponse to mailfloss

How to connect Emma to mailfloss

How to connect iContact to mailfloss

How to connect Sendpulse to mailfloss

How to connect Wishpond to mailfloss

How to connect Benchmark to mailfloss

How to connect Mautic to mailfloss

How to connect Campaigner to mailfloss

How to connect MailUp to mailfloss

How to connect VerticalResponse to mailfloss

How to connect ActiveTrail to mailfloss

How to connect Autopilot to mailfloss

How to connect Customer.io to mailfloss

How to connect Mailigen to mailfloss

How to connect Remarkety to mailfloss

How to connect Iterable to mailfloss

How to connect DailyStory to mailfloss

How to connect Braze to mailfloss

How to connect multiple accounts from the same provider

How to disconnect an integration

Floss options for an email service provider

Ortto email verification options

Attentive email verification options

What mailfloss reads and writes in Klaviyo

Use a Master List for faster flossing

Email verification Frequency Options

Email verification Action Options

How do I turn on/off automatic verification?

Add your blacklist/whitelist options

How to floss only a specific email list/segment/tag

How to use Custom Fields or Tags to Unsubscribe Contacts

What are the custom fields and tags that mailfloss updates and which ESPs support them?

Email verification Aggressiveness Options

What do category exclusions do?

Encharge email verification options using mailfloss

GoHighLevel email verification options using mailfloss

Ghost email verification options using mailfloss

Beehiiv email verification options using mailfloss

MailChimp email verification options using mailfloss

Keap email verification options using mailfloss

HubSpot email verification options using mailfloss

Ontraport email verification options using mailfloss

Drip email verification options using mailfloss

Kit email verification options using mailfloss

Constant Contact email verification options using mailfloss

Campaign Monitor email verification options using mailfloss

AWeber email verification options using mailfloss

ActiveCampaign email verification options using mailfloss

Sendlane email verification options

Klaviyo email verification options

Brevo email verification options

MailerLite email verification options

Moosend email verification options

Gist email verification options

GetResponse email verification options

Intercom email verification options

Emma email verification options

iContact email verification options

Sendpulse email verification options

Wishpond email verification options

Benchmark email verification options

Mautic email verification options

Campaigner email verification options

MailUp email verification options using mailfloss

VerticalResponse email verification options

ActiveTrail email verification options

Autopilot email verification options

Customer.io email verification options

Mailigen email verification options

Remarkety email verification options

Iterable email verification options

DailyStory email verification options

Braze email verification options

ClickFunnels email verification options using mailfloss

What does Normal aggressiveness do?

What does Aggressive aggressiveness do?

What does Custom Floss do?

Bulk import operations for connected integrations

[Action Option] Manually decide action on invalid emails

[Action Option] Auto-Unsubscribe invalid emails

[Action Option] Auto-Delete invalid emails

[Action Option] Auto-Update custom fields/tags of invalid emails

[Action Option] Do not modify emails

Floss options for files

How to upload and floss a spreadsheet

Can I upload multiple files at once?

How can I upload, enter, or import emails to mailfloss?

How do I do a one-time or one-off cleanup of a CSV file?

Flossing results and reports

How do I buy prepaid credits or purchase a subscription?

How do I export or download floss session results/reports?

How do I export all available flossed emails per integration?

How to permanently delete email addresses from mailfloss

How to append mailfloss results to an uploaded CSV file

How to merge spreadsheets using Google Sheets

How to merge spreadsheets using Microsoft Excel

Do you show analytics?

What's included in the verification report? What happened to the rest of the file data I uploaded?

Zapier Integration

Use mailfloss as a Zapier trigger

Use mailfloss as a Zapier action

Create a Zap - connect Zapier and mailfloss

Plans and Pricing

Can I send billing receipts to a different email address?

Pricings for Subscription plans, Subscription Add-Ons and Prepaid credits

How do I add more credits to my account?

Adding Additional User Seats

How do I add more features to my subscription?

Uploading Option Disabled During Free Trial

Do prepaid credits come with the same features as subscription plans?

What happens to my remaining subscription credits if I cancel my subscription?

Understanding Your Credits: Subscription and Prepaid

Understanding Prepaid Credits

Understanding Subscription Credits

Do you offer a free trial?

Do prepaid credits ever expire?

Do I need a credit card to sign up?

Can I change, downgrade or upgrade my plan at any time?

Can I cancel anytime?

Do you have an affiliate program?

Where do I find invoices?

How do I request a refund?

How to add a credit card

What forms of payment do you accept?

How do I cancel my subscription?

Which subscription plan should I choose?

Enterprise plans

How do I delete my account?

What happens if you cancel a free trial?

What is overage and how does it work?

What is Auto-refill and how does it work?

How to Request a Manual Invoice

Troubleshooting

Need Help? Here's How to Contact Us

Can I Change The Invoice Email Address?

Why were fewer emails verified than what I uploaded?

Integration Issues: API Key Permissions

Issues with Zoho CRM

Flossing stopped working, not flossing, not verifying, or didn't floss all emails

Can't connect an integration

High bounce rate after flossing

I exported my emails from my email service provider and uploaded it to mailfloss. Will it sync back to the ESP?

Flossing is slow or stuck

Yahoo and Hotmail detection limitations

I didn't receive my verification email, what do I do?

How to verify if the mailfloss custom properties were created in HubSpot

Understanding App Load Conditions and High Load Banner

Is Decay Protection overconsuming credits?

What happens if I cancel a batch verification? Why the process isn't completely stopped?

Feature: Spotless

Spotless: clean other contact fields, not just email

Feature: Typo Fixer

Fixing typos in company email domains

How do I get the Typo Fixer feature?

How does the Typo Fixer feature work?

How can I tell if an email address typo was fixed?

I'm using the Typo Fixer. What if the suggested email address is already a subscriber, what happens when the Typo Fixer tries to fix the typo?

Typo Fixer limitations

Handle custom fields and fixed typos: automated rules and exceptions

Feature: Instafloss

How to enable Instafloss for Ortto

Enabling Instafloss for Real-Time Capabilities Across Integrations

Adding Instafloss as an Add-on

What does Instafloss do?

Instafloss delay recommendations

How to enable Instafloss for Encharge

How to enable Instafloss for Sendlane

How to enable Instafloss for Moosend

How to enable Instafloss for Gist

How to enable Instafloss for Wishpond

How to enable Instafloss for Campaigner

How to enable Instafloss for DailyStory

How to enable Instafloss for Klaviyo

How to enable Instafloss for Braze

How to enable Instafloss for AWeber

How to enable Instafloss for MailUp

How to enable Instafloss for Remarkety

How to enable Instafloss for Iterable

How to enable Instafloss for Customer.io

Instafloss for GetResponse tradeoff/warning

Understanding Discrepancies Between Kit and Instafloss

Migrate Iterable system webhook to workflow webhook for Instafloss

Feature: Autofloss

How to Autofloss a single list

What does Autofloss do?

Feature: Decay Protection

What does Decay Protection do?

How to set Decay Protection custom mode

Feature: Update Tags/Custom Fields

Campaigner Custom Fields Instructions

MailUp Custom Fields Instructions

DailyStory Custom Fields Instructions

Constant Contact custom field limitations

Benchmark custom field limitations

Feature: Javascript Widget

How to add the Javascript widget to your page

How to connect the JS widget to Convertful

How to connect the JS widget to GetResponse

How to connect the JS widget to Wisepops

How to connect the JS widget to Mailchimp

How to connect the JS widget to a plugin in WordPress

How to connect the JS widget to Sumo

How to install the Scripts n Styles plugin on WordPress

How to connect the JS widget to Hellobar

How to connect the JS widget to OptiMonk

How to connect the JS widget to Leadpages

How to connect the JS widget to Convertkit

How to connect the JS widget to Sleeknote

How to connect the JS widget to ClickFunnels

How to connect the JS Widget to InstaPages

How to connect the JS Widget to OptinMonster

Feature: Google Sheets Extension

How to install and use the mailfloss Google Sheets extension

Feature: Airtable Extension

How to install and use the mailfloss Airtable extension

Can mailfloss Limit Service to Servers in Specific Countries?

Anti-spam Policy

Data Retention Policy

Data Processing Agreement

Are you HIPAA compliant?

Are you Soc II compliant?

Where are your servers located?

What does it mean if an account is suspended, paused, under review, or banned?

Are you GDPR compliant?

Are you CCPA compliant?

Do you have a VAT?

How we encrypt and transmit data

Do you have an API?

Do you support webhooks?

How to Generate an API Key and Add a Webhook in mailfloss

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Policies

Data Processing Agreement

0 min

Our Data Processing Addendum is part of our Terms of Use. See section 12, Data Protection, of our terms here.

Updated 18 Oct 2026

Data Retention Policy

Are you HIPAA compliant?

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