Email setup all ok, roundcube send/rcv working, but not in any other mail client

Hi, I would like to ask for help. I have set up one email address under my test domain. I can send and receive emails in Roundcube. But when I try to set up this email in my favourite email client, it simply cannot connect or verify my settings.  See my picture in this post. Clean install of actual CWP7. Can anyone please help me to solve this prolem?
Thanks a lot in advance.
http://www.macy.cz/download/mail_settings.png

I can't see the screenshot, have you removed it?

I was configuring another Panel, so my previous hosting installation was inactive with the screenshot became unavailable, sorry..

BUT... You know what? Everything is and WAS working before, the problem was in loopback of my ISP provider. I am not able to look back at my server over the internet, so I have to use VPN. I've set up my email now in 30 seconds and everything is woring.