Yes,
I must be honest.
I had tried in the past a loto of things, including a change in the timeout setting on Mdaemon and Avast side, but it doesn't work.
This breaking up of messages downloading activity happens when all seems to work perfectly.
I will try to put the same issue in MDaemon Forum to see if it's a known issue there.
Another strange thing that happens using IMAP features in Outlook 2003, I know I'm sliping "off topic", is the automatic "read" notification that leave from Outlook with no way to stop it (the only way is to block TCP or other rude solutions like this). No config modification can help it.
Anyway thanks. I will provide any useful info I should eventually discover.
Stefania