Hi all, I'm at my first Postfix "real-world" configuration, and I have a
problem I can't solve just reading www.postfix.org configuration help.

I must install and configure Postfix on a Linux machine that will act as the
domain mailserver, and that is behind a firewall. The machine will serve
about 100 clients (outlook). 90 of them will be allowed to send/receive mail
only to/from local accounts (just internal mail). 10 of them will be allowed
to send/receive mail to/from elsewhere in Internet.

Well, I created an access table (file: /etc/postfix/access_ext) like this:

allowed_user1 OK
allowed_user2 OK
...
allowed_user10# OK

Then I set the smtpd_recipient_restrictions parameter to accept all local
recipients and recipients whose sender is listed in the table:

smtpd_recipient_restrictions = permit_auth_destination, check_sender_access
hash:/etc/postfix/access_ext reject

It worked, so disallowed users can't send mail out of domain.

The problem is that I can't find the way to reject mail that comes from out
of domain to a local user. In fact the smtpd_sender_restrictions parameter
doesn't seem to have a sort of "check_recipient" value.

Can someone help me?

Thanks
Alessio Fiore
afiorealteanet.it

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