Hi all,

a few days ago I posted a relaying configuration problem that I solved
today, so I want to post the solution I found... it could be useful for
someone else...

The problem was: A single host, with Postfix, manages a domain's mail (ex:
foo.com). Each user can send/receive mail to/from other local users
(xyzfoo.com) without limitations, but only a limited group of users can
send/receive mail to/from the whole Internet.
The solution I found was:

1) Edit the access map file "access_external" with following lines:

        allowed_user1 OK
        allowed_user2 OK
        ...
        allowed_usern OK

2) Edit the regexp file "reject_nonlocal.regexp" with following line:

        /^(.*)(.*)$/!/^(.*)(.*)(\.)?foo\.com$/ REJECT

3) Set smtpd_recipient_restrictions parameter in main.cf as follows:

        smtpd_recipient_restrictions = reject_non_fqdn_sender,
           reject_non_fqdn_recipient,
           reject_unknown_sender_domain,
           reject_unknown_recipient_domain,
           check_recipient_access hash:/etc/postfix/access_external,
           check_sender_access regexp:/etc/postfix/reject_nonlocal.regexp,
           permit_auth_destination,
           check_sender_access hash:/etc/postfix/access_external,
           reject

Hope this could be useful for someone...

Alessio Fiore
afiorealteanet.it

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