First of all, thank you for your detailed and informative answer ;-)
I was now looking on the system I use, but there is one more open question...
In the users directory, at the same level as "Maildir", there is a folder
"@attachments" (which is currently empty). Does this folder usually
contain any usefull information? Lots of my e-mails have attachments.. so
it seems this folder might have nothing to do with my attachments.. right?
It has nothing to do with Courier. Whatever created that folder, it's not
I believe, now I know all I should... NO! Something is missing... Where can I get/read all that kind information? I don't want to bother the whole list each time I have a little need... ;-)