Registration Hygiene

E-mail Validator

Q: What rules does an e-mail need to follow to be valid?

A valid e-mail follows RFC 5322: allowed characters before the @, without starting or ending with a period, valid domain and TLD with at least two letters.

Q: Does the validator identify temporary e-mails?

The validator detects common terms in temporary domains like tempmail and yopmail, allowing suspicious registrations to be flagged.

Q: How to deal with incorrect typing in registrations?

Suggest automatic corrections for common errors like gamil→gmail and confirm with the user before completing the registration.

Q: Does this validation guarantee that the e-mail exists?

Validation confirms only the format. To ensure existence, use e-mail confirmation, SMTP VRFY (when available) or double opt-in.

Q: How to implement a complete verification policy?

Implement format validation, DNS checking, link confirmation, and multi-factor authentication, also using tools like the Secure Password Generator.

Reduce campaign rejections, avoid registrations with disposable domains, and offer smart suggestions to your users.

Benefits

• Instant format validation.
• Detection of disposable domains.
• Automatic suggestions for common errors.

Related Tools

Utilize também o Secure Password Generator e o CPF Validator em fluxos de onboarding completo.

Endereço de e-mail*

Dica: combine esta validação com confirmação via link ou código OTP para garantir que o usuário tem acesso ao e-mail fornecido.

Why validate e-mails?

Incorrect addresses affect marketing campaigns, invoice issuance, and password recovery flows. By validating the format at the time of registration, you reduce SMTP rejections, improve deliverability, and increase the quality of the database.

Our tool does not store the entries and can be used freely by product, marketing, and support teams.

Most frequent typing errors

Error	Suggested Correction	Note
gamil.com	gmail.com	Common transposition on cell phones.
hotamil.com	hotmail.com	Inverted letter.
outlok.com	outlook.com	Omitting a letter.
yaho.com	yahoo.com	Frequent typing error.

Present these suggestions in real time to reduce contacts lost due to human error.

Recommended verification flow

Validate the format with this tool.
Check DNS/MX records to ensure the domain receives e-mails.
Send link or OTP code for confirmation (double opt-in).
Activate bounce monitoring and remove invalid e-mails from the database.

Frequently Asked Questions

Doubts about format, temporary domains, and integrations.

What rules does an e-mail need to follow to be valid?+

The address must contain only allowed characters (letters, numbers, ., _, -, % and +) before the @, not start or end with a period, and have a valid domain with a TLD of at least two letters. Our tool follows RFC 5322 guidelines to validate the format.

Does the validator identify temporary e-mails?+

Yes, we check common keywords in disposable e-mail domains (tempmail, yopmail, 10minutemail). This helps to mark risky registrations, although new variations may arise. Use it as an additional signal and not as a definitive block.

How to deal with incorrect typing in registrations?+

Invalid e-mails generate campaign returns and onboarding failures. The tool suggests corrections for classic errors (gamil → gmail) and you can offer these suggestions to the user before saving the registration.

Does this validation guarantee that the e-mail exists?+

No. We only validate the structure. To confirm the existence of the address, send a code by e-mail, use protocols like SMTP VRFY (when allowed) or adopt double opt-in in marketing campaigns.

How to implement a complete verification policy?+

Combine this validator with domain verification via DNS, confirmation by activation link, and multi-factor authentication. Also use the Secure Password Generator to strengthen the registration of new users.