email_message_fingerprint

Summary

email_message_fingerprint is a canonical fingerprint of a specific email message.

Canonical form

An email_message_fingerprint value MUST be the sha256_hex digest of the compact UTF-8 JSON serialization of:

[from_address, to_address, message_id, subject, body_sha256]

where from_address and to_address are canonical email_address values.

Example

For a message with:

• from_address = "alice@example.com"
• to_address = "bob@example.com"
• message_id = "msg-123@example.com"
• subject = "Hello Bob"

and body bytes corresponding to:

Hi Bob,
Lunch tomorrow?

Alice

the normalized body is:

Hi Bob,\nLunch tomorrow?\n\nAlice\n

so:

body_sha256 = "daff6b8671e7651c09f046cd989578ade4152f3534deb5ea81f064e0640c5a12"

The compact UTF-8 JSON serialization is:

["alice@example.com","bob@example.com","msg-123@example.com","Hello Bob","daff6b8671e7651c09f046cd989578ade4152f3534deb5ea81f064e0640c5a12"]

The resulting fingerprint is:

473e7bf6b8b08d0d642378f4716d021933edfe88a2f2aac7b2244fc5a7015d16