[quote]are you sure I will get all my old emails back this way
I am sure you won’t! But I thought you already got them back - you wrote:
[quote]…> Now I can connect to it via www.mail2web.com so the mailbox is still there!
or am I creating an new mailbox ?
Yes - I suggest you don’t for now!
I think your settings are screwed. Tell Support that Edit Address fails to find a mailbox confirmed to exist by Filters and Spam.
BTW, did you make the change that caused this using browser Back, multiple windows or bookmarks?