Adds Key: value header rows under the subject, validated with carrier's rules: keys of 1-64 letters, digits and dashes, unique case-insensitively, none of the fields the client sets itself, and the whole block inside the reader's budget. A reply to a message with the sender's own fields asks whether to carry copies over. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
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