DigiKitEmail Format Checker
Instantly check whether an email address is formatted correctly. This tool does not verify that the address actually exists or can receive mail — it only checks the syntax (the @ sign, domain, and extension).
Format looks right but mail still isn't arriving?Format checking catches typos (a missing @, a missing extension), but it can't catch an address that doesn't exist or a full inbox. To confirm real deliverability, send a verification email or confirm with the recipient through another channel.
Why it matters
One mistyped email address in a form means the order confirmation, invoice or password reset link never arrives. The user rarely notices the typo. They just assume your email didn't come. A format check catches the most obvious mistakes at signup, while the person is still on the page. If you manage a mailing list, weeding out malformed addresses also makes your delivery reports easier to trust.
What a format check can't catch
- Typos in the domain: name@gmial.com is perfectly valid syntax, and almost certainly wrong.
- Accounts that have been closed or abandoned.
- Addresses from disposable, throwaway email services.
- A correctly formatted address that belongs to someone else.
Common mistakes
- Writing rules so strict they reject valid addresses. Plus signs (name+news@example.com) and long domain endings like .photography are legitimate.
- Not trimming spaces from a pasted address. It looks right but fails the check.
- Storing an address typed in capitals as a different user. The domain part isn't case-sensitive.
- Accepting addresses with non-Latin characters in the user name without thinking. Few mail systems handle them well, so it's safer to ask for a plain version.
A sample scenario
A small online shop keeps hearing from customers who never got their order confirmation. Looking at the records, some addresses end with a stray period and others have typos in the domain. The shop adds a live format check to the checkout form and, for misspellings of common providers, shows a "Did you mean...?" suggestion. Malformed addresses no longer get saved, and most typos get fixed by the customers themselves.
When you need stronger verification
If you need to know the address really belongs to the person, for example when opening an account or starting a subscription, the only reliable method is sending a confirmation link to it. If you send bulk email as a business, get advice on consent and unsubscribe rules, which vary by country.