[Exim4U] maildrop

Hi Guys! I am trying to make maildrop work with exim4u, but I don't have much idea how to make it work. The aim is: - if the user has a .mailfilter file in its $HOME, then pipe the message to maildrop with the specific .mailfilter file of the user Exim4u has a bultin piping solution in the web interface also, maybe this can be achieved through that? How do I have to use that? If I don't want to achieve this through the web interface, and I want to make it a default behaviour if the . mailfilter file exists, what are the steps to do? I would really appreciate some help with this! Thank you in advance! Regards, Daniel