邮箱提取器
从任意文本提取实用邮箱地址；支持ASCII dot-atom本地部分、Unicode域名验证、域名保留／小写／Punycode输出、大小写去重规则、四种输出分隔符、复制与TXT下载。
使用步骤
如何使用
- Paste up to 100,000 characters of source text.
- Choose duplicate handling, domain formatting, and the output separator.
- Extract the addresses, review the practical syntax limits, then copy them or download a text file.
Practical mailbox syntax
The extractor supports unquoted ASCII dot-atom local parts, including plus tags and common RFC atext symbols. Local parts cannot begin or end with a dot or contain consecutive dots. Domains must contain at least two valid DNS labels; Unicode domains are validated through the browser IDNA parser. Quoted local parts, comments, domain literals, and SMTPUTF8 local parts are intentionally outside this tool.
Deterministic normalization and deduplication
Results keep their source order. Domain names can retain source spelling, be lowercased, or be converted to lowercase ASCII Punycode. Duplicate comparison always normalizes the domain through IDNA and can either respect or ignore local-part case; the first displayed spelling is retained. Extraction is limited to 10,000 addresses and output to 500,000 characters.
常见问题
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Does an extracted address definitely exist?
No. This tool checks practical text syntax only. It does not query DNS, contact a mail server, or send a verification message.
Why are quoted or Unicode local parts excluded?
They require broader email standards and context-sensitive parsing that can create surprising matches in arbitrary prose. This tool documents and uses a predictable unquoted ASCII local-part scope.
How are duplicates compared?
Domains are compared case-insensitively after IDNA conversion. You can choose whether the local part is also compared without case; the first occurrence controls the displayed result.