*Ominous salutation, 8 letters
A letter you don't want to receive, 8 letters
Beginning of the end of a relationship?, 8 letters
Foreboding salutation, 8 letters
Prelude to a breakup, 8 letters
Letter announcing a switch to Toro?, 13 letters
Letter sent to a tractor company?, 13 letters
Bits of breaking news?, 15 letters