Crossword puzzle clue "mail hole"

Site of an undesirable hole inside a desirable hole

Hole in one on a par 5 hole

Duffer's sad 18th-hole reply to "Bogey for you?" ... and 19th-hole request to the bartender?

Hole whose eagle would be a hole-in-one

Mail hole

Forgets to mail the mail, say

They come after signatures in snail mail, yet before signatures in e-mail: Abbr.

___ mail (e-mail folder)