Thank you very much for the support. I tried it and it is working. I also found this java system tray library: https://git.dorkbox.com/dorkbox/SystemTray. It looks very promising.
How to add SWT? I downloaded swt.jar and copied it to the davmail/lib folder. But there is still no transparency.
How to add SWT? I downloaded swt.jar and copied it to the davmail/lib folger. But there is still no transparency.
Have the same issue with DavMail 5.1.0 on Manjaro (Arch) Linux and XFCE4. There is a gray background (instead transparent) and the icon is not properly sclaed (the yellow cyrlce with the flash is smaller than the gray rectangle).