| Answer | Crossword Clue |
|---|---|
| GPO | Main mail HQ |
| GPO | Mail HQ |
| GPO | Mail-sorting HQ |
| GPO | Local mail HQ |
| APO | HQ for G.I.'s mail |
| GPO | Main mail ctr. |
| GPO | Main mail sta. |
| GPO | Main mail facility: Abbr. |
| GPO | Main mail facility (abbr.) |
| GPO | Main mail building: Abbr. |
| CCED | Sent an e-mail to someone in addition to the main recipient |
