What is the Email Address Validator?

The Email Address Validator checks whether an email address is correctly formatted and whether its domain exists. Paste a single address or a list and get instant results — identifying which addresses are valid, which are malformed, and which domains don't appear to accept mail.

It's useful when cleaning an email list before a campaign, checking addresses during form validation, or verifying a specific address before adding it to a system.

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How to Use the Email Validator

1. Enter an email address — paste it into the input field. The tool accepts a single address or multiple addresses, one per line.
2. Validate. The tool runs checks on each address immediately.
3. Read the results — each address is marked valid or invalid, with a reason for any failure.

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What Gets Checked

Format validation — the tool checks that the address follows the correct structure: a local part (before the @), the @ symbol, and a domain part with at least one dot (e.g. [email protected]). Common formatting errors caught include:

• Missing or multiple @ symbols
• Invalid characters in the local part
• Missing or malformed domain (no dot, invalid TLD)
• Leading or trailing spaces
• Double dots in the local part ([email protected])

Domain existence — the tool checks whether the domain portion of the address actually exists and has DNS records. An address can be perfectly formatted but still be undeliverable if the domain doesn't exist.

MX record check — mail delivery requires the domain to have MX (Mail Exchange) records pointing to a mail server. The tool checks for these. A domain without MX records cannot receive email, even if it resolves correctly.

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What It Doesn't Check

Mailbox existence — verifying whether a specific inbox ([email protected]) actually exists requires sending a test message or using an SMTP-level probe. This tool does not send any email and cannot confirm an individual mailbox is active.

Catch-all domains — some domains are configured to accept mail for any address, regardless of whether the mailbox exists. Validation tools cannot reliably detect invalid addresses at these domains.

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Common Use Cases

Email list cleaning — before sending a campaign, run your list through the validator to remove addresses that will bounce. High bounce rates damage sender reputation and can trigger spam filters or blacklisting.

Form and registration validation — catch typos and formatting errors at the point of entry, before an invalid address makes it into your database.

Database hygiene — periodically validate stored email addresses to remove entries that have become invalid since they were collected.

Developer testing — verify that your application is correctly formatting email addresses before sending, or that your validation regex matches the expected pattern.

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Privacy

Email addresses entered into this tool are not stored, logged, or used for any purpose other than performing the validation you requested. No emails are sent to the addresses you check.