I'm using IMAP

Pls have a look on this screenshots: http://we.tl/Z7tydzQqsD
The inbox is grey and not editable.

Ok Thank you burnout, it sounds complicated, but I will try to follow your instructions

What about point 2? I'm missing mails which are sent to my website e-mail addresses. There are mails which I sent, but no incoming mails in the inbox of each account - only in the main inbox.

"Opera Mail is no longer being developed and is no longer being supported."
So there will be no new versions anymore?

I'm using Opera Mail now for 6 months and have several problems with it. I already searched in the forum, but can't find anything to my problems. Hope to get any feedback from you. Besides, it's really annoying that there is no personal email support from Opera.

Using Opera Mail on Mac OSX, with several mail addresses from google mail, gmx and my own website like info@..., sales@... and so on.

1. I have several mail boxes. everything comes to ONE inbox. how can I change it? How can I skip the inbox? How can I control what is shown at my Inbox?
2. I have several mail boxes. everything comes to ONE inbox and is not in the Inbox of each mail box. The mails are missing there.
3. How can I move mails from the Inbox without deleting them?
4. I'm using google mail, with labels - in Oper Mail nothing is sorted. All filters from google mail getting ignored. Everything comes to my Inbox. And all mails are more then once doubled - sometimes I have 5 same messages. Where are the filters in Opera Mail?

Please help. Thanks.