Omniver:
> I have a mail server receiving internet mail for my primary domain and for a
> few virtual domains.  I'm having some spam issues with internet mail coming
> in for address@mydomain for addresses intended for use by local
> tools/scripts which are listed in /etc/aliases.  Any ideas on how can I make
> it that postfix accepts mail for these addressesI *only* if they were sent
> by my mail server?  

A crude but simple solution:

- Add the server's IP address to Postfix mynetworks.

- Block some recipients if mail does not come from mynetworks:

    /etc/postfix/main.cf:
        smtpd_recipient_restrictions = 
            permit_mynetworks
            check_recipient_access hash:/etc/postfix/recipient_access
            ...
            reject_unauth_destination
            ...

    /etc/postfix/recipient_access
        us...@example.com reject
        us...@example.com reject

Crude because it adds the server to mynetworks.

        Wietse

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