Thank you very much for your help.
I've tried to use an ancient version of that no-deps version, but it had the issue with the "appended" folder lists... I didn't know there was a new version for that... sorry, and I thank you again for pointing this out.
Now that it works well along with the SMTPClient, another problem shows: emails with attatchments stops the app even under Companion. I've tried to solve this problem by changing the scope, but nothing seems to work.... except coming back to the previous "com.sunny.ImapClient.aix".
Am I missing something?
Thank you again.
Bernat.