| Abbreviation | Definition |
|---|---|
| DDU | Destination Delivery Unit |
| DE | Germany |
| DEPT | Department |
| DF | Damage Free |
| DJ | Djibouti |
| DK | Denmark |
| DLB | Dead Letter Box |
| DLO | Dead Letter Office |
| DM | Delayed Mail |
| DM | Direct Mailing |
| DM | Dominica |
| DMARC | Direct Mail Accreditation Recognition Centre |
| DMCS | Domestic Mail Classification Schedule |
| DMM | Domestic Mail Manual |
| DMU | Detached Mail Unit |
| DNO | Distribution Networks Office |
| DO | Dominican Republic |
| DOA | Damaged On Arrival |
| DODAAC | Department Of Defense Activity Address Code |
| DPBC | Delivery Point BarCode |