I think to make it do exactly what you want you'll have to modify your
sendmail/postfix/whatever-mta configuration to deliver "local" email
locally and then punt all other email to your ISPs SMTP server.
That's what I do. Have Postfix punt everything non-local to the ISP's
"smart host" using the "relayhost" configuration.
Or ... could you just use Fcc:? I mean, if you want a local copy with
a Date: header and all, that would do it.
I've never liked fcc: and always dcc: myself instead.
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