What makes an email address valid?

A valid email address has three parts: a local part (before the @), the @ symbol, and a domain (after the @). The local part can contain letters, numbers, and certain special characters. The domain must include at least one dot and a valid TLD (top-level domain) like .com, .org, or .net.

Does this tool verify if the email actually exists?

No, this tool validates the email format only — it checks that the address follows the correct structure according to RFC 5322 standards. To verify if an inbox exists, you would need to send a test email or use an email verification service that checks MX records.

Why does the tool suggest a corrected email address?

The tool recognizes common typos in popular email domains like gmail.com, yahoo.com, and hotmail.com. If your domain looks like a misspelling of a common provider, it will suggest the likely intended domain.

Is this email validator free to use?

Yes, completely free with no limits. All validation happens in your browser — no email addresses are sent to any server, keeping your data private.

What is the @ symbol's role in an email address?

The @ symbol separates the local part (your username) from the domain. Every valid email address must have exactly one @ symbol. The local part precedes it and the domain name follows it.

メールアドレス検証ツール

メールアドレスを瞬時に検証します。フォーマットチェック、一般的なドメインのタイポ検出、ローカルパート・ドメイン・TLDの詳細分析。

メールアドレス

メールアドレスを入力すると、フォーマットを検証して詳細な診断情報を提供します。

使い方

メールアドレスを瞬時に検証します。フォーマットチェック、一般的なドメインのタイポ検出、ローカルパート・ドメイン・TLDの詳細分析。

1Type or paste an email address into the input field.
2The validator checks the format in real-time as you type.
3Review the breakdown showing local part, domain, and TLD.
4Check for any issues listed below the status badge.
5If a typo is detected, click the suggestion to auto-correct.

主な機能

Real-time format validation as you type
Detailed breakdown of local part, domain, and TLD
Typo detection for popular domains (Gmail, Yahoo, Hotmail)
RFC 5322 compliant validation rules
100% client-side — email addresses are never sent to a server

よくある質問

詳しく読む

Email Validation Guide: How to Check Email Addresses Online