Email Validation is one of the 
iClosed Data Intelligence feature that verifies whether an email address entered on the form is real as soon as it is submitted.
It acts as the first qualification checkpoint, preventing fake, disposable, or risky email addresses from entering your funnel, unless the phone number is set as the primary contact field on the form.
Important note
Email validation can be turned on by the account owner only.
Each lookup consumes 0.5 credits
How Does It Work
Email Validation evaluates key signals including deliverability status, domain type, role-based or disposable indicators, toxicity risk, and an overall confidence score.
The validation runs a comprehensive lookup and provides the following feedback on entry:
Email validity and format
Email type (Main email, Temporary or Shared inbox)
Deliverability confidence
Email Toxicity as per score received
By validating email deliverability and quality early, iClosed helps you stop unqualified leads before they progress or book a call, while also saving credits by skipping costlier steps such as Credit Score checks when an email is invalid.
Logic
Email Validation confirms whether a lead’s email address is real and reachable by performing a comprehensive email lookup.
If the email is returned as invalid or risky, iClosed will skip downstream steps such as Credit Score checks to save credits.
See details here
See details here
The validation runs immediately when an email is entered and provides the following feedback:
Email format and existence check - iClosed first verifies whether the email address is syntactically valid and exists. This step is mandatory for both validation modes.
Deliverability and quality evaluation - Once the email format is valid, iClosed evaluates deliverability and quality signals, including:
Deliverable vs. undeliverable status
Disposable or temporary email detection
Role-based mailbox detection (e.g. info@, sales@)
Domain type (free, corporate, accept-all)
Toxicity risk indicators
Confidence score assessment - Each email is assigned a confidence score from 0 to 100, representing the likelihood that the email is valid and safe to use.
A score below 50 is considered invalid by default.
This baseline rule is visible to customers and can be used in qualification logic.
In short, Email Validation feature prevents a lead from passing through the form until a valid email address is provided:
Email format must be valid
Confidence score must be 50 or higher
Disposable or high-risk emails are blocked
The rate limit is set to 5 attempts per IP.
After 5 failed attempts, iClosed will block further validation, mark lead as potential (unqualified) and skip any email or/and Credit Score check after.
Lookup Terms
Every email address entered or edited is treated as a new lookup.
Validation for Emails which are in your
Global Data and were validated already won't be validated again - won't count against your credit usage. Email Validation can be used for:
Lead qualification (disqualification or conditional routing)
As a precondition for Enrichment and Credit Score checks
After a lead from the same IP attempts to pass through Email Validation 5 (five) times, email validation will stop to prevent additional costs, including Enrichment and Credit Score checks, and the lead will be marked as potential.
Results:
Reduces time spent following up on invalid, undeliverable, or fake email addresses.
Improves email outreach performance by identifying deliverable emails and filtering out disposable or role-based addresses.
Improves lead quality by filtering out leads with disposable emails, role-based mailboxes, low confidence scores, or high toxicity risk.
Better spam prevention, as users attempting to repeatedly submit fake or temporary email addresses are stopped immediately.
Pro tips
As email validation is one of the pre-conditions for Credit Score check, iClosed will skip the Credit Score check if the email was returned as invalid to prevent spending of the wallet credits.
Setting Up Email Validation
Here's how you can set up Email Validation for your account:
Turning Email Validation ON
Navigate to 
AI Scheduler - Events page to turn on Email Validation:
Click on the Event where you want to apply Email Validation
Select Data Intelligence section
Click on the toggle button to turn it on
Save configuration and test it out
Make sure to purchase credits in 
Settings - Billing before testing it if you haven't already. Here's a quick video on how to turn it on:
Pro tips
Once you've purchased the credits, kindly note that it's advisable to turn on auto-recharge in your wallet to ensure you always have enough credits which will prevent Data Intelligence features from stopping.
Finding Validation Results
Validation results can be found in 
Global Data - all sections or inside of the lead Contact Card:
Global Data
- Global Data - all sections → make sure the column Email validation is selected
Contact Card
Journey, along with all email edits
FAQs
Where can I see usage of the credits for my Email validations?
Where can I see usage of the credits for my Email validations?
You can view Email Validation credit usage from:
iClosed will store logs showing each validation attempt, including the validated email, result (valid or invalid), credits consumed, and the exact time the validation was triggered.
Is Email Validation mandatory for Credit Score check?
Is Email Validation mandatory for Credit Score check?
yes, it is, and Credit Score check can't be turned on without email and phone validation both.
What happens if I don't have enough credits in wallet?
What happens if I don't have enough credits in wallet?
In case you run out of wallet credits, email validation as any other Data Intelligence feature will be stopped.
To prevent that from happening, we advise turning on auto-recharge in your wallet in 
Settings - Billing - Credits Usage.
Can I re-validate emails that were collected by iClosed before validation was turned on?
Can I re-validate emails that were collected by iClosed before validation was turned on?
No, that isn't available as a specific feature.
What you can do as a workaround is to copy email of a lead and try to enter it again on the form where Email Validation is turned on.
In case you decided to do this, it's advisable to use event specifically made for your appointment setters to use, or for this purpose only, to avoid messing up the data in your main events embedded in your funnel.
But, take into consideration that you may hit IP rate limit in case you try to validate wrong email more than five times.
From the validation perspective, is it better to have email as primary contact information or phone number?
From the validation perspective, is it better to have email as primary contact information or phone number?
To be fully transparent, there is no right or wrong answer here. The best answer is behind the question on which of these two your leads are more likely to respond back.
If it's an email, rather than phone number, you should collect email first and while doing so, to validate every email entered.
Is validation available to business email addresses as well?
Is validation available to business email addresses as well?
Yes, email validation will be applied to all emails, included business emails.
Additionally, iClosed provides feature available with Business subscription plans to accept business email domains only.
You can turn on this option in Event - Invitee Questions section next to an email.
What will be validated first if I have business email lookup and email validation both turned on?
What will be validated first if I have business email lookup and email validation both turned on?
In case you have email validation turned on in Data Intelligence, along with rule to accept business emails in Invitee Questions, business email check on the form will run first.
That said, email validation (credit consumption) won't run until business email is entered.
Is Email Validation used for outreach or compliance?
Is Email Validation used for outreach or compliance?
Email validation primary function is to help you identify your lead and outreach opportunities easier.
It helps you unveil what you can expect from the email entered and not just that, but to ensure only leads with real emails can book a call with your team.
Learn more