So, until now I've been using an "accept all" rule for MTA
functionality. Specifically:
accept from local for any relay hostname $HOSTNAME
Which was fine when I was the only one using the server, but now that
I'm adding potentially untrustworthy users, I don't want any
authenticated user to be able to send mail as any other user. Ideally,
if I had an entry for `[email protected]` in my passwd file, then a user
logged in as `[email protected]` would only be able to send mail with the
sender `[email protected]` and any other address would be rejected.
My first attempt at this went a little something like:
accept from local for any relay as "%{user.username}" hostname $HOSTNAME
But from looking at my logs, it appears that variable expansion isn't
being done in the relay "as" statement.
The docs seem particularly vague on doing something like this. Has
anyone achieved this?
Thanks,
Josh Kunz
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