Hi,

I am running an exim 3.36 mail server (Debian), which handles some
distribution lists via an alias file.

e.g.:

members: user1, user2, user3
veryspecialmembers: user5, user7, user13

I want to avoid that this aliases can be reached from everywhere (e.g.
for the distribution of even more spam to local users...)

How could I restrict the posting privilege to one of this specific
aliases to internal users (from the local network)?

Alternative: How could I restrict the posting privilege for one of this
lists to specific sender addresses?

Thanks in advance!
Andreas