Back in 2016, DBus support for reading mail addresses from Osmo has been added in the origin/dbus branch.
The MUA Balsa has support for it (although it is not activated by default in the configure script). I still use Osmo 0.2.14 (!!) from this branch, and it works just fine for me…
Would it be possible to re-activate/merge the DBus support from this (very old, I know) branch into the current mainline release?
TIA, Albrecht.