anonymize-fixture

name	anonymize-fixture
description	Anonymize a raw .eml email file for use as a test fixture. Scrubs PII from headers, URLs, and body content while preserving MIME structure, HTML layout, and encoding.
argument-hint	<input.eml> [output.eml]
disable-model-invocation	true

Anonymize Email Fixture

Anonymize the raw email file at $0 for use as a test fixture. Write the result to $1 (default: replace the input file in-place).

Read the input file, then systematically apply the rules below. Write the anonymized result to the output path.

See reference.md for the complete anonymization rules.

Process

1. Read the full .eml file
2. Identify PII — sender/recipient names, email addresses, tracking URLs, IPs, message IDs, auth tokens
3. Classify the sender — personal name vs. organizational (see reference.md for heuristics)
4. Apply replacements following the rules in reference.md, working section by section: headers first, then each MIME part's body
5. Preserve structure — MIME boundaries, Content-Transfer-Encoding, quoted-printable soft breaks (=\r\n), base64 blocks, HTML tag structure, CSS properties
6. Write the anonymized file
7. Verify by scanning the output for any remaining PII (real domains, names, IPs, tokens). Report what was changed and flag anything uncertain.