On 27/04/2021 05:59, alan_m wrote:

The most annoying thing I've found with Thunderbird is when the email is
received in a html(?) format and a web browser has to be called up to
open and to read it. The mail once opened in a web browser then goes
missing from the list and a re-index of the folder has to be performed
to make it appear again. It doesn't happen every time but in the past
few years enough times to realise this is happening and the re-index is
my first choice when I cannot find something (usually something I have
read hours before, with a tracking number etc.).

On my T'bird (52.9.1 ) it's View Message Body As Plain Text.

--
Spike