[Exim] lowercased email-addresses generated by filters

Hi list,


I have a problem, I want to forward my mails to another account and
using the + feature of cyrus on the remote server.

The problem is, if I do something like this =>

if $h_list-post contains "exim-users@???" then
save .Exim/
deliver masta+Exim@???
endif

exim delivers the mail to masta+exim@???, but Cyrus is
casesensitive when it comes to the "folder part" of the address :-/

Can I prevent the lowercasing somehow?

ciao