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Allow user to send email without smtp authentication


Check out the lightweight on-premises email archiving software developed by iRedMail team: Spider Email Archiver.


This tutorial is applicable to iRedMail-0.9.9 and earlier releases. If you're running a later release, please follow this tutorial instead.


Create a plain text file: /etc/postfix/sender_access.pcre, list all users' email addresses which are allowed to send email without smtp authentication. We use user email address for example:

/^user@example\.com$/ OK

It's ok to use IP address instead like below:

For more allowed sender format, please check Postfix manual page: access(5).

/^192\.168\.1\.1$/ OK
/^192\.168\.2\./   OK
/^172\.16\./       OK

Update Postfix config file /etc/postfix/ to use this pcre file:

smtpd_sender_restrictions =
    check_sender_access pcre:/etc/postfix/sender_access.pcre,

Restart/reload postfix to make it work:

# /etc/init.d/postfix restart


iRedAPD plugin reject_sender_login_mismatch will check forged sender address. If sender domain is hosted on your server, but no smtp auth, it will be considered as a forged email. In this case, iRedAPD will reject this email (with rejection message: Policy rejection not logged in), so we need to bypass the sender email address. If email is sent from an internal network device like printer, fax, we can also add its IP address directly.

MYNETWORKS = ['', '']

Restarting iRedAPD service is required if you updated /opt/iredapd/