# How to allow user to send email without authentication [TOC] ## Create a plain text file: `/etc/postfix/accepted_unauth_senders`:

fax-machine-12@mydomain.tld OK

## Use postmap to create hash db file:

# postmap hash:/etc/postfix/accepted_unauth_senders```

## Modify Postfix to use this text file: `/etc/postfix/main.cf`

smtpd_sender_restrictions = 
    check_sender_access hash:/etc/postfix/accepted_unauth_senders,
    [...OTHER RESTRICTIONS HERE...]

## Restart/reload postfix to make it work:

# /etc/init.d/postfix restart