Under  Account Settings> Copies and Folders: unclicking "place a copy in" doing a test and then reclicking "place a copy in"  (directed to sent folder)

           2. Sent folder works fine on my on-line email ( I normally work with storing locally on my MacBook Air) but on-line email is not TB so likely irrelevant

Yesterday, midday, my sent file stopped storing new messages after years of flawless service I have tried: - closing TB and shutting down laptop and restarting Under Account Settings> Copies and Folders: unclicking "place a copy in" doing a test and then reclicking "place a copy in" (directed to sent folder) FWIW: 1.only thing I have done differently lately is create a Template 2. Sent folder works fine on my on-line email ( I normally work with storing locally on my MacBook Air) but on-line email is not TB so likely irrelevant