How to protect an is-spam@xxx and no-spam@xxx alias?

[Patrick Dung]

Hi

I want user to forward spam mails to is-spam at mydomain.com and not spam
mails to non-spam at myhomdin.com.

However, I don't want the people in the internet to send mail to these
to account. But the people in the internet can send mail to other user
in the system.

Can this be done in Sendmail (and postfix and qmail)?

Regards
Patrick

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