Crossword Puzzle Post office annoyance

Clue: Post office annoyance

Post-office fixture (FLAGPOLE with 8 letters)
Post office unit (OUNCE with 5 letters)
Post office delivery: Abbr. (LTR with 3 letters)
Post office need (e.g. DATER with 5 letters)
Do a post-office job (SORT with 4 letters)
Special-handling designation at the post office (REGISTEREDMAIL with 14 letters)
Post office request (ZIPPLUSFOUR with 11 letters)
MD office posting (HRS with 3 letters)
Post-office purchases (STAMPS with 6 letters)
POST OFFICE (KISSINGGAME with 11 letters)