Here are the possible solutions for truly letter sign off clue
Answer
Clue
Relevancy
yours
Clue
__ truly (letter sign-off)
yrs
Clue
"___ truly" (abbreviated sign-off)
myhumps
Clue
2005 Black Eyed Peas hit that Pitchfork called "so monumentally vacuous, slapped together and tossed-off that it truly tests the definition of 'song.'"