Related Clues:
- FYI kin
- Mail-routing letters
- Letter-routing notation
- Letter-routing abbr
- Envelope's routing abbr
- 'This is for,' on an env
- Interoffice email abbr
- Abbr. to begin a business letter
- Package abbr
- Directional abbr
- ''This is for,'' on an envelope
- Abbr. on a cover sheet
- Fax cover sheet abbr
- Routing notation
- Envelope-routing abbreviation