* Checks syntax (RFC 5322). Does not verify inbox existence.
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Email Syntax & Standards
Email validation is a critical step in maintaining data hygiene and ensuring successful communication. A valid email address must conform to specific standards defined by the Internet Engineering Task Force (IETF). The standard format consists of a local part (the username), followed by the "@" symbol, and a domain part.
The Local Part can contain letters, numbers, and special characters like dots, underscores, and plus signs, although some providers place restrictions on their usage. The Domain Part must be a valid domain name registered in the DNS system, ending with a Top-Level Domain (TLD) such as .com, .org, .net, or country codes like .uk, .pk, and .in.
Using our validator helps developers and data managers clean mailing lists. It identifies common syntax errors such as missing the "@" symbol, invalid characters, or spaces within the address. This reduces bounce rates and improves the deliverability of email marketing campaigns significantly.
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Use ToolExamples
Personal Email (Valid)
A standard Gmail address following correct syntax rules.
john.doe@gmail.comCorporate Email (Valid)
A custom domain email often used for business communication.
support@notoolsleftbehind.comMissing Domain (Invalid)
Fails validation because the domain name part is missing.
user@comFrequently Asked Questions
Does this tool check if emails are real?
No. This tool only checks if the format (syntax) is correct. It cannot verify if the inbox exists or is active. To verify existence, you would need to send a verification email or perform an SMTP handshake, which requires a backend server.
How do I remove invalid emails?
In Bulk mode, after validation, you can click the "Remove All Invalid" button to instantly filter out bad emails. You can also manually delete specific rows using the red "X" button next to each email.
What is the limit for bulk testing?
To ensure browser performance and stability, the bulk checker is limited to processing 100 emails at a time. If you have more, please split your list into batches.