Hi!
It's cool, that someone has made attempt to create open-source candy-look webmail client. Since all other open webmail clients ugly enough on a look.
But, unfortunately, I have found, that in roundcube there are serious problems with charsets. Below I have put two files: one (charset-correct.jpg) shows, as the text looks before sending, and the second (charset-sent.jpg) as it looks after.
The text is written in cyrillic charset windows-cp1251.
Thanks for attention!