these questions are not related to i-mscp in any way - I just hope to find people here who have already realised what I am trying to achieve. And I couldn't find the answers to my questions elsewhere.
So I have installed the Roundcube-plugins-plugin (:-D) and with them came the Sieve filters, very well. They actually work (mostly), but I find it a bit awkward to configure them in the web-interface of my Roundcube Webmail and looked around for another solution. I found this Thunderbird Extension Sieve, which purportedly would allow me to create or edit filters out of the Thunderbird interface. Problem is: I can't get a connection to my server, whatever I have tried as server address and authentication (the IMAP credentials of the account should be fine, no?). Has anybody succeeded in getting this to work and could give me a hint, as to the address and the credentials needed?
Further, while moving messages to a desired folder works very well with the Sieve filters, marking messages as read doesn't at all. What is the trick to achieve this?
I am trying to reduce my dependency on Google, but I already miss gmail for its ease of filtering ... And Spam combat - but that's a different subject.