Create a plain text file: /etc/postfix/accepted_unauth_senders
:
fax-machine-12@mydomain.tld OK
Use postmap to create hash db file:
# postmap hash:/etc/postfix/accepted_unauth_senders
Modify Postfix to use this text file: /etc/postfix/main.cf
smtpd_sender_restrictions =
check_sender_access hash:/etc/postfix/accepted_unauth_senders,
[...OTHER RESTRICTIONS HERE...]
Restart/reload postfix to make it work:
# /etc/init.d/postfix restart
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