Email Validator Guide: What a Format Check Really Proves
Learn which address mistakes a format check catches and why it can never prove an inbox exists.
What is the Email Validator?
Type an address and this tool checks its structure: exactly one @ sign, a non-empty local part and domain, a dot in the domain, and a sensible ending, while flagging common typing patterns such as double dots or a domain that starts with a dot. It checks format only, so a well-formed address may still belong to nobody, and it never tests deliverability or mailbox existence.
How to use it
- Type the email address.
- Click Validate.
- Read the format verdict and the specific issue, if any.
Worked example
For the sample hello@example.com, the tool reports Format: Looks valid and Issue: None found, with a note that this is a format check only and does not test deliverability or mailbox existence.
What makes an email address well formed?
Roughly, one @ sign, text on both sides of it, a dot in the domain, and no spaces or double dots. Anything beyond that shape needs a real delivery test.
Frequently asked questions
Does a valid result mean the mailbox exists?
No. This tool only checks the shape of the address; confirming a mailbox would need a message to be sent and answered.
Why flag domains like gmial?
Because they match the shape of a well-known provider with a letter out of place, which is a frequent cause of mail going to the wrong place.