Email Format Check | How to use and interpret results
Check email candidates against a practical address-shape pattern and list the outcomes. An @ sign and a domain separator are format clues, not proof of a deliverable mailbox.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Separate addresses with spaces, commas or semicolons. Supply the address itself rather than a complete mail header with a display name and angle brackets.
Results and examples
[email protected] fits the basic shape, whereas name.example.com lacks @. A passing candidate still may not exist or accept mail at that domain.
Worked example
[email protected] fits the basic shape, whereas name.example.com lacks @. A passing candidate still may not exist or accept mail at that domain.
Limitations
- No MX lookup, mailbox probe or test email is sent.
- The checker does not accept every internationalized address or unusual RFC-valid syntax.
Fields
| Field | Guidance and constraints |
|---|---|
| Email (one per line, or separated by commas/spaces) | Check the unit and format displayed beside this field. |
| Result | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Does passing mean an address can receive mail?
[email protected] fits the basic shape, whereas name.example.com lacks @. A passing candidate still may not exist or accept mail at that domain.
Will the tool send a test message?
No MX lookup, mailbox probe or test email is sent. The checker does not accept every internationalized address or unusual RFC-valid syntax.
