DEARSIRS

Set to 2 different clues across 2 published puzzles, most often "To whom it may concern" alternative — The New York Times, Thursday, 10 June 2010.

8 letters

Every clue on record, most used first

"To whom it may concern" alternativeonce
The New York Times — Thursday, 10 June 2010
Fusty greetingonce
The New York Times — Saturday, 17 October 2009