Postfix and always_bcc

[Alessio]

Hi,
I need to backup all the email on my server, i use always bcc fot this
purpose..
Now i need to backup only external mail, with recipient or sender not
in my mail domain. Example:
ales...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@mydomain.com >
l...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@mydomain.com NOT BACKUP
j...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@msn.com -> ales...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@mydomain.com BACKUP
ales...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@mydomain.com ->
j...<http://groups.google.it/groups/unlock?msg=252f0a3ec9298be5&_done=/group/mailing.postfix.users/browse_thread/thread/a455966855b20d63>
@msn.com BACKUP
do you help me?
Thanks in advance
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