Data Processing // Online

Email List Validator Validator..

An email list validator checks every address in your list for syntax errors, verifies MX records to confirm the domain accepts mail, detects disposable email providers, flags role-based accounts like info@ and admin@, and catches common domain typos. This tool processes your emails in two phases: instant client-side checks for syntax, disposable domains, role accounts, and typos, then server-side MX record verification via DNS-over-HTTPS. Only domain names are sent to the server — email local parts stay in your browser. Validate up to 100 emails free, filter results by category, and export a CSV with status annotations and formula injection protection.

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Domain names are sent to our server for MX verification; email local parts stay in your browser. No email addresses are stored.

Supports comma, semicolon, or newline separated emails

0 emails

or
Upload CSV or TXT File

Drag and drop or click to browse. CSV files auto-detect the email column.

Free tier: up to 100 emails with full features
How to Use

Get Started in 3 Steps

Step 01

Add Your Email List

Paste email addresses one per line, separated by commas or semicolons. Or upload a CSV or TXT file — the tool auto-detects the email column from headers like "email" or "e-mail".

Step 02

Review Validation Results

Each email is categorized as Valid, Invalid Syntax, No MX Record, Disposable Domain, Role Account, or Typo Detected. Use the filter buttons to focus on specific categories and review the donut chart for list quality at a glance.

Step 03

Export Clean List

Download the results as a CSV with email, status, reason, and suggestion columns. The export applies formula injection protection by prefixing dangerous characters with a single quote. Use the status column to filter in your spreadsheet.

How It Works

Under the Hood

The validator processes your email list in two phases. First, client-side checks run entirely in your browser: RFC 5322 syntax validation, domain extraction and deduplication, typo detection against a curated map of 50+ common misspellings, role account identification for 20+ functional prefixes like info@ and admin@, and disposable domain detection against a database of 500+ known throwaway providers.

Second, unique domains are sent to the server in batches of up to 50 for MX record verification using DNS-over-HTTPS queries to Google Public DNS. This confirms whether each domain actually has mail exchange servers configured to receive email. Domains without MX records will hard-bounce 100% of the time.

The local part of each email address (everything before the @ symbol) never leaves your browser. Only domain names are transmitted for MX lookups. Results are computed and displayed immediately without any server-side storage or logging.

The exported CSV includes formula injection protection: any cell starting with =, +, -, or @ is prefixed with a single quote to prevent spreadsheet applications from executing the value as a formula when the file is opened in Excel or Google Sheets.

FAQ

Frequently Asked Questions

What does the Email List Validator check for each email address?
Each email is checked across six dimensions: syntax validation against RFC 5322 patterns, MX record verification to confirm the domain accepts mail, disposable domain detection against a database of 500+ throwaway email providers, role account identification for addresses like info@ and admin@ that rarely convert, domain typo detection for common misspellings of Gmail, Yahoo, Hotmail, and Outlook, and domain deduplication to minimize API calls. Syntax, typo, role, and disposable checks run instantly in your browser. Only domain names are sent to the server for MX lookups — email local parts never leave your device.
How does bulk email validation reduce bounce rates before a campaign?
Sending to invalid or non-existent addresses generates hard bounces that damage your sender reputation with mailbox providers like Google and Microsoft. A bounce rate above 2% can trigger deliverability penalties including spam folder placement for all your outbound mail. Validating your list before sending identifies addresses that will definitely bounce — those with invalid syntax, non-existent domains, or missing MX records — so you can remove them. This tool also flags risky addresses like disposable domains and typos that frequently lead to bounces or zero engagement.
Is my email data secure when using this bulk validation tool?
Your email data is processed primarily in your browser using client-side JavaScript. The only data sent to the server is domain names — for example, gmail.com or company.io — to verify MX records exist. The local part of each email address (the portion before the @ symbol) never leaves your browser. No email addresses are stored on our servers, logged, or accessible to anyone. The MX lookup results are returned immediately and not cached. You can verify this by inspecting network requests in your browser developer tools.
What is the difference between role accounts and disposable emails?
Role accounts are functional email addresses tied to a department or function rather than a specific person — addresses like info@, support@, admin@, sales@, and noreply@. They exist on legitimate domains but typically have low engagement rates and high unsubscribe rates for outbound campaigns. Disposable emails use temporary mailbox services like Mailinator, Guerrilla Mail, or YOPmail that self-destruct after minutes or hours. Both should be flagged before sending, but for different reasons: role accounts waste outreach effort, while disposable addresses indicate the recipient is actively avoiding contact.
How does the domain typo detection algorithm identify misspelled email addresses?
The typo detector maintains a curated map of common misspellings for the most popular email providers including Gmail, Yahoo, Hotmail, Outlook, iCloud, AOL, and ProtonMail. When an email domain matches a known typo pattern — for example, gmial.com instead of gmail.com or yaho.com instead of yahoo.com — the tool flags it and suggests the corrected address. This catches emails that would pass syntax validation and even MX checks (some typo domains are registered) but will never reach the intended recipient. Fixing typos before sending prevents bounces and recovers otherwise lost contacts.
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