Crossword puzzle clue "like most mailed letters"

Like most mailed letters

Like most mailed pkgs.

Where clay letters are mailed?

Like an envelope that's ready to be mailed

"The most-played, most-imitated, most influential puzzler of all time," per the video game website IGN

___ ballot (vote that's mailed in)

Greeting mailed to a married couple

ISP that reportedly mailed out more than 660 million CDs over the years