| Answer | Crossword Clue |
|---|---|
| APO | General mailing address?: Abbr. |
| ATTN | Mailing label abbr. |
| INV | Bookkeeper's mailing: Abbr. |
| USPO | Mailing station (abbr.) |
| POS | Mailing stations: Abbr. |
| GPO | Mailing center: Abbr. |
| GPO | Central mailing facility (abbr.) |
| TPO | Mobile mailing place: Abbr. |
| SASE | Manuscript mailing enclosure: Abbr. |
| DBMS | Mailing-list software: Abbr. |
