Sendmail - forwarding to external domains

[IanTurner]

In need to set up email forwarding such that anything recieved by joe at local domain gets a copy forwrded to joe at external domain.

I found out how to use the mail aliases to forward to a different domain on the same server but it won't work if I try to forward to an external domain, I guess I must be missing something but haven't figured out what it is yet.

[IanTurner]

Solved it - needed to set up mail aliases correctly, rather than the virtuser table.