I have configured postfix to act as a relay on my Mac Laptop. I want to now enforce an authentication on postfix so that any client trying to connect on port 25 needs to authenticate first. Is this possible?
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Yes, it is possible. You can use SASL to achieve this function. On Mac, install
cyrus-sasland modify the following settings in the Postfix configuration file to enable SMTP authentication and restrict relay access:You also have to create a file at
/etc/postfix/login_mapsand add entries for the authenticated users. This file maps email addresses to usernames and passwords. Each line should be in the format:Then generate hashed database file using:
After making these changes, restart the Postfix service to apply.