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Accepted
James L
Asked: 2010-08-13 06:38:03 +0800 CST

Postfix restrict which users can send out without authentication

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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?

linux centos email smtp postfix

2 Answers

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

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  2. Best Answer
    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

    [email protected]  OK
[email protected]  OK

    or you can add a domain and then list only blocks

    example.com   OK
[email protected]       550 Account compromised
[email protected]      550 Account closed
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