If I export a msg to a .eml file I can open that msg with either mail or thunderbird and it displays fine. (its one of those ads from almost any store); If I export that email from tbird to dt3, or run apple script from mail to add msg and attachment to DT3, then the msg gets into DT3 but shows as:
I’d be glad to email you the .eml file (seems to happen with most of the emails which arent just straight text)
I also note that when I click on the msg in DT3, then DT3 churns for 20sec or so before displaying the could not decode msg…