From this HBR article:
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Start email with single sentence summary:
Bottom line: This is a better way to write emails informed by US Military practices.
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Then have a Background section that succinctly provides the necessary context for the "bottom line."
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Keep the whole thing as short as possible, ideally to avoid the reader having to scoll.
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Link to files in a shared folder (Dropbox, OneDrive, SharePoint, etc.) rather than sending attachments. This avoids inbox clutter, makes it easy to reference specific files, and ensures the recipient has the newest version of the file.
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Use one of these tags at the beginning of the subject:
- ACTION – Compulsory for the recipient to take some action
- SIGN – Requires the signature of the recipient
- INFO – For informational purposes only, and there is no response or action required
- DECISION – Requires a decision by the recipient
- REQUEST – Seeks permission or approval by the recipient
- COORD – Coordination by or with the recipient is needed