[Evolution] Fetching mails from another mail account

[Rudolf Künzli <rudolf kunzli gmail com>]

I have a slight problem.
Evolution 3.22.6 Fedora 25

I did set up another mail account which I like to fetch into Evolution.
All is set up - pop and smtp as usual.
I did send a mail to that account and waited the message to be fetched
into Evolution. I can see it is fetched but the message doesn't show up
in the Inbox.
Can I debug/trace this operation?
Any help would be appreciated.
Thanks

-- 
Rudolf Künzli <rudolf kunzli gmail com>