I read other similar threads and found what I had assumed would work, but I probably don't have a good enough understanding of Postfix.
I have a single domain on this particular server, but postfix is configured for virtual domains.
I want an email that arrives for a real local user to not only be delivered to the local system, but also send a copy to
someone@anotherdomain.com
If I make an entry in /etc/aliases, it sends to the remote user, but no local copy.
If I make an entry in /etc/postfix/virtual it does the same thing.
Thanks for your help
Jim