Hello everyone !
I finally decide to post here because I didn't find any solution on the web that worked for me :/
I explain my situation :
I installed RC 1.2.9 on my Raspbian 9 home server, who was already running Nginx/Dovecot/Postfix/MariaDB.
Everything in the install worked like a charm, no errors and the final test of IMAP & SMTP worked fine.
I use Evolution to connect on that mail server so I did receive the "Test message from roundcube".
Login to RC is ok, but I can't send or receive any mails (seems to be running into void with the loading logo visible) and all of my folders (who are well detected) are empty !
I tried several differents configurations but I'm completely stuck right now. Maybe a fresh look over the situation will lead me to fixing this issue
Stranges things are there is no errors nowhere (in the log directory of RC, or in /var/log/mail.* etc...).
And when I create a new directory in Evolution for example it appears instantly in RC, but no matter what I do it still being empty.
Note that RC also get stuck (at least for a while) when I try to access preferences settings, and never shows the menu I asked for.
I am a bit lost right now so don't hesitate to tell me any ideas or leads !
Have a nice day
ps : I can post config output if needed
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RC 1.2.9 --> Nginx/Dovecot/Postfix/MariaDB