| Answer | Crossword Clue |
|---|---|
| NIXIE | Undeliverable mail |
| NIXIE | Undeliverable piece of mail |
| nixy | an undeliverable piece of mail |
| DLOS | Places for undeliverable mail: abbr. |
| DLO | Where undeliverable mail goes: Abbr. |
| DLO | Place for undeliverable mail: Abbr. |
| NIXIE | Undeliverable piece of mail: Slang. |
| nixies | NIXY, an undeliverable piece of mail |
| DLO | P.O. spot for undeliverable mail |
