[Exim] envelope-sender after calling from shell

i've got a problem with exim on my multi-domain linux-boxes. When i
invoke exim from shell not being root the envelope-sender is always set to
username@hostname.

I know i can change this by adding the username invoking exim to the
trusted_users. But i don't want to add 1000s of users to that list. And it is
not possible to include a file, so this solution seems not to be good.

Any further ideas from you guys?

thanx

andreas gietl