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Home / Email & Mailto Tools / Email Address Splitter
Email & Mailto Tools

Email Address Splitter

Inspect email address components locally and export parsed rows as CSV without querying mail servers.

Runs locallySyntax ≠ deliverabilityIDN-awareDisplay names accepted
Readyv266 export adds mailbox, display_name, address, local_part, entered_domain, ascii_domain, status, and reason columns in CSV or TSV.

These tools work locally on text. Syntax validation is not mailbox verification: no DNS/MX lookup, SMTP connection, account-existence check, or deliverability test is performed.

Email Address Splitter: Mailbox, Tag & Domain Audit

Break addresses into mailbox, plus tag and domain evidence, then summarize valid rows, unique domains and duplicates locally.

Mailbox → components → CSV/TSV

Preserve display name separately from addr-spec, local part, entered domain and normalized ASCII domain so spreadsheet imports do not lose context.

Deliverability remains a separate network question

These tools intentionally stop at local parsing, normalization and URI construction. A syntactically valid address can still have no MX service, no mailbox, a catch-all domain, or delivery restrictions; v266 does not label those network states without actually checking them.

Practical guide and verification

Use the product first, then apply these tool-specific checks to verify assumptions, interpret the result, and hand it off safely without moving the primary workflow below generic content.

Splitting an address is not the same as validating delivery

A mailbox can be separated into local part, optional plus tag, and domain without proving that the address exists or accepts mail. Syntax-level parsing does not query DNS, authenticate a domain, or contact a mailbox. Keep component extraction separate from deliverability checks and never describe a parsed address as verified solely because it was split successfully.

Preserve the original address beside derived columns

Plus addressing and local-part rules vary by provider, and the local part can be case-sensitive in the protocol even though many providers ignore case. When preparing CSV or TSV output, retain the untouched address together with derived mailbox, tag, and domain columns so downstream users can audit how each row was interpreted.

Normalize domains cautiously

Internationalized domains can appear as Unicode or punycode, and visually similar characters can belong to different scripts. If a workflow requires normalization, document whether it uses the displayed Unicode form, ASCII punycode, or both. Do not silently rewrite local parts because provider-specific aliases and normalization rules are not universal.

Handle lists as personal data when appropriate

Email addresses can identify people or organizations. Browser-local processing reduces unnecessary transfer, but copied exports still need appropriate handling. Remove rows you do not need, avoid exposing address lists in public screenshots, and clear data from shared devices after the task. Parsing convenience does not remove privacy obligations for the resulting file.

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