| Answer | Crossword Clue |
|---|---|
| unmailable | that cannot be sent by mail |
| frank | mark indicating that a piece of mail may be sent postage free |
| franked | mark indicating that a piece of mail may be sent postage free |
| mailability | the ability to be sent by mail |
| mailabilities | MAILABILITY, the ability to be sent by mail |
| parcel | A thing or collection of things wrapped in paper in order to be carried or sent by mail |
