Postfix restrict which users can send out without authentication

Question

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?

Answer 1

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

joe@example.com  OK
fred@example.com  OK

or you can add a domain and then list only blocks

example.com   OK
goofy@example.com       550 Account compromised
stinky@example.com      550 Account closed

Answer 2

Take a look at the postfix documentation. http://www.postfix.org/RESTRICTION_CLASS_README.html