>Personally, I don't know about configuring the MTA, but what was done
>at this site was to alter the -outgoing alias to something
>non-standard. It doesn't really matter what it is, as long as it's
>internally consistent between the two lines in the aliases file.
The problem with this is that it relies purely on people not being able to
guess/find out this non-default alias which is a little risky. You can
argue over how much better making the alias un-mailable from remote sites
but it's clearly better. Still chaning from -outgoing to something
"unguessable" is a *big* improvement on leaving it as -outgoing.