Given that Trojita has not been updated in several years and there seems to be no interest in resolving all of its bugs, including this one that appears to be a security issue, I would like to suggest Thunderbird replace Trojita in future Lubuntu releases, beginning with 22.04.
The first ting I did once I installed Lubuntu on my desktops, was to uninstall Trojita and install Thunderbird, after I first saw all the unresolved bug reports.
I’m sure Trojita is a nice e-mail client and I understand it’s inclusion in the release because it’s written with Qt, but the large number of unresolved bugs (currently 127) combined with the lack of a recent release, was simply too much.
Thank you.