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Possibly a simple question but I'm trying to lockdown which users can send email from the local machine. I've locked down which ones can receive by running newaliases on an /etc/postfix/allowed_recipients file and setting something similar to
smtpd_recipient_restrictions = hash:/etc/postfix/allowed_recipients, reject
It works, but how can I do the same for sender restrictions?

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up vote 1 down vote accepted
smtpd_sender_restrictions = reject_unknown_sender_domain, reject_unlisted_sender, check_sender_access hash:/etc/postfix-internal/localusers, reject

Inside localusers, list each OK address  OK  OK

or you can add a domain and then list only blocks   OK       550 Account compromised      550 Account closed
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when I try to use newaliases on that file it complains, is there a better way to generate the .db? – James L Aug 12 '10 at 15:05
Newaliases is only for alias files, generally /etc/aliases. Postfix files are compiled with postmap command. – labradort Aug 12 '10 at 17:11

Take a look at the postfix documentation.

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