Dear Claws Mail developers,
Claws Mail 3.9.3-84-g4d0f2b for Win32 is still utilizing GTK+ 2.16.6.
GTK+ 2.16.6 is very outdated an old though. It was released way back in 2009.
Could you please update GTK+ 2 to the latest version, which, at the time of writing this, is version 2.24.23?
It would be much appreciated.
The Win32 version of Sylpheed also has been updated to GTK+ 2.24.23, you can read about it over there:
The new Claws Mail 3.10.0-2-g51af19 for Win32 is also still utilizing the old GTK+ 2.16.6.
3.12.0-1 release contains latest GTK+.