I decided to use fetchmail because I have a multiuser (my family :). Linux and fetchmail delivers mail to the smtp port where qmail takes over.
Installation was no problem, multidrop works with the following .fetchmailrc :
poll PersonalMail.Germany.EU.net protocol pop3 username myname password mypassword # the next two lines do the trick for multidrop localdomains mydomain.de is * here # T2 of the fetchmail FAQ states that qmail needs this forcecr