The Clue
Epistle appendage: Abbr. (3 letter answer)
The Answer
PPS
Tags
Notes
The answer PPS is uncommon, appearing about once every 525 puzzles.
Related Clues
After-afterthought
Letter abbr.
Letter apps.
Letter ender?
Ltr. addendum
Bottom-of-a-letter letters
Correspondent's second afterthought
Later afterthought: Abbr.
Leter ended, for short
Letter addenda: Abbr.
Letter addendum, for short
Letter adjunct: Abbr.
Letters after letters
Letters below the letter
Second addendum to a letter
Second letter addendum
Second ltr. addendum
Second ltr. addition
After-afterthought on a letter: Abbr.
Afterthought No. 2 on a letter
Sec. addition to a signed letter
Second addendum to a letter: Abbr.
Second afterthought in a letter: Abbr.
Second letter addendum: Abbr.
"Also, I almost forgot ...": Abbr.