# Allow user to send email without smtp authentication

Attention

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

## Postfix

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 `user@example.com` 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/main.cf` to use this pcre file:

    smtpd_sender_restrictions =
        check_sender_access pcre:/etc/postfix/sender_access.pcre,
        [...OTHER RESTRICTIONS HERE...]

Restart/reload postfix to make it work:

    # /etc/init.d/postfix restart

## iRedAPD

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 its IP address directly.

- To bypass sender email address `user@example.com`, please add setting in `/opt/iredapd/settings.py` like below:

    ALLOWED_FORGED_SENDERS = ['user@example.com']

- To bypass sender IP address or network, for example, `192.168.0.1` and `192.168.1.0/24`, please add setting in `/opt/iredapd/settings.py` like below:

    MYNETWORKS = ['192.168.0.1', '192.168.1.0/24']

Restarting iRedAPD service is required if you updated `/opt/iredapd/settings.py`.

## References

- Postfix documents:
  - check_sender_access
  - Manual page: access(5)
  - Manual page: pcre_table(5)