Email Checker
Validate email format, detect typos, spot disposable providers, and flag role-based addresses — instantly in your browser.
Enter Email Address
What we check
- - RFC 5322 format compliance
- - Common domain typos (gmial → gmail)
- - Disposable / temporary email providers
- - Role-based addresses (info@, admin@)
- - Local part and domain length limits
- - Suspicious dot placement
- - Top-level domain validity
Enter an email address and click "Check Email" to validate.
Free email address checker
Bad email addresses cost real money. Every bounce hurts your sender reputation, and disposable sign-ups waste onboarding resources. This free email checker catches problems before they reach your mailing list — running entirely in your browser with zero server calls.
What the checker validates
The tool runs nine checks against each address you enter:
- RFC 5322 format — the gold standard for email syntax compliance.
- Local part length — must not exceed 64 characters per RFC 5321.
- Domain length — DNS limits domains to 253 characters.
- Domain typo detection — catches misspellings of major providers like Gmail, Yahoo, Hotmail, Outlook, and iCloud.
- Disposable provider check — flags 35+ known temporary email services (Mailinator, Guerrilla Mail, Yopmail, etc.).
- Provider type — identifies whether the domain is a free provider or a custom/business domain.
- Role-based address — flags shared inboxes like info@, admin@, and support@ that tend to have lower engagement.
- Dot placement — catches leading, trailing, or consecutive dots that may cause delivery issues.
- TLD validity — ensures the top-level domain is plausible.
Email checker rules table
| Check | Pass signal | Warning or fail signal |
|---|---|---|
| Format | Address matches standard email syntax. | Missing @, invalid domain, or unsupported characters. |
| Domain typo | Domain is not in the typo map. | Common typo such as gmial.com or outlok.com. |
| Disposable provider | Domain is not a known temporary inbox provider. | Known disposable domain that can hurt list quality. |
| Role address | Local part looks like an individual inbox. | Shared inbox such as info@, admin@, or support@. |
Email validation method
The checker method starts with syntax validation, then reads the local part and domain separately. It compares the domain against typo and disposable-provider lists, checks role-address prefixes, and returns a result for each rule. This workflow is useful for list hygiene because it separates hard format failures from softer warnings that need human review.
Worked example
If you enter admin@gmial.com, the checker first confirms that the address has a valid email shape. It then flags gmial.com as a likely typo for gmail.com and warns that admin@ is a role-based inbox. The result is not a mailbox-existence proof, but it gives you clear cleanup actions before importing the address into a CRM or sending platform.
When to use this tool
- Before importing a contact list into your CRM or email marketing platform
- During user registration form design — add client-side validation
- When reviewing a sign-up CSV to filter out disposable addresses
- To quickly check a single address before sending an important email
Limitations
This tool validates syntax and patterns. It cannot confirm that a mailbox actually exists, because that requires an SMTP handshake with the recipient server — something browsers cannot do. For full deliverability verification, pair this tool with a server-side verification API.
Does this tool send my email to a server?
No. Every check runs locally in your browser using JavaScript. Your email address is never transmitted anywhere.
What does the email checker validate?
It validates RFC 5322 format compliance, detects common domain typos (like gmial.com), flags disposable/temporary email providers, identifies role-based addresses (info@, admin@), and checks for unusual length or characters.
Can this tool verify if an email actually exists?
No. Verifying delivery requires sending SMTP requests to the mail server, which cannot be done from a browser. This tool catches formatting errors, typos, and risky patterns before you attempt delivery.
What is a disposable email address?
Disposable (or temporary) emails are from services like Guerrilla Mail or Tempmail that provide short-lived inboxes. They are commonly used to bypass sign-up forms and are risky for transactional email.
About This Calculator
Free email address validator. Check format, detect common typos, spot disposable email providers, and flag role-based addresses. 100% browser-based, no data sent anywhere.
Frequently Asked Questions
How do I check an email address?
Enter the address and run the checker. It validates syntax, local and domain length, common domain typos, disposable domains, role-based inboxes, dot placement, and TLD shape.
Does the Email Checker upload my address?
No. The checks run in your browser, so the email address is not sent to a SuperCalc server.
Can this checker prove an inbox exists?
No. Browser-only checks can catch syntax, typo, and risk patterns, but mailbox existence requires server-side SMTP or provider verification.
What does a disposable email warning mean?
It means the domain appears in a known temporary inbox list. These addresses are often risky for sign-up quality, transactional email, and CRM hygiene.
When should I use a server-side email verifier?
Use a server-side verifier when you need deliverability confirmation, MX checks, or SMTP-level validation before sending campaigns.
The SuperCalc Editorial Team maintains calculator interfaces, formula notes, examples, and supporting explanations. Methods, assumptions, source links, and review depth vary by calculator and are documented on the relevant page where available.