Forward all but one address ?

[John Grant (Concordant Networks)]

Well after a successful installation that receives
email for a domain and just sends it on to the real server I have hit a snag.

Current fix: smtproutes contains the following:

domain_to_relay.com:server_to_relay_to

Alas *one* email address at domain_to_relay.com 
has to stay local to my server (without getting relayed
on and then back (tried that approach).

Anyone have a good suggestion how to relay all,
but that one special address ?

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                                      John