Answer:

post

Answer	Crossword Clue
POST	Assignment
POST	Mail a letter
POST	Mail

POST	Place notices
POST	Writing on the wall, perhaps?
POST	Blog contribution
POST	Washington paper
POST	Place for hitching
POST	Blog entry
POST	Racetrack pole
POST	Denver newspaper

POST	Bird feeder mount
POST	Tweet, e.g.
POST	Work station
POST	Emily of etiquette
POST	Military station
POST	Put on a board
POST	Tack up, as a notice
POST	Alpha-Bits maker

POST	Online forum entry
POST	Put up
POST	Military assignment
POST	Washington daily
POST	Military installation
POST	Sentry's place
POST	Column
POST	Place for a guard

POST	Station
POST	Big name in breakfast cereal
POST	Newsgroup message
POST	Blog comment
POST	Opposite of pre-
POST	Blog update
POST	Chime in at a blog
POST	Jerusalem newspaper

POST	Display, as a dean's list
POST	Message sent to a newsgroup
POST	Starting gate
POST	Word after hitching or scratching
POST	Upright