Answer: mashnote

AnswerCrossword Clue
MASHNOTE

Lovey-dovey letter

MASHNOTE

Bit of steamy prose

MASHNOTE

Billet-doux

MASHNOTE
Effusive love letter
MASHNOTE
It might be signed with tic-tac-toe symbols
MASHNOTELove letter
MASHNOTEItem in fan mail.
MASHNOTEIt might end "xoxoxo"
MASHNOTESteady correspondence