Hi vaadiners 
I just finished install liferay 6.0.5 (much easier than 5.x) and also it contains vaadin mail portlet. no need to install it 
Well, i have this little problem, when I try to send or save a mail, it shows me this warning:
“Unable to send message. No folder exists with the primary key 0”
I tried to find a solution on liferay forum and actually there is a topic about this " https://www.liferay.com/es/community/forums/-/message_boards/message/5570970 " but i really didn’t understand. They talk about “imap server things” and I get lost there.
I hope you guys can help me. Thank you very much.