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    You are at:Home»Mail Servers»Postfix»Postfix: Configure SASL Authentication for Remote SMTP

    Postfix: Configure SASL Authentication for Remote SMTP

    By RahulDecember 12, 20222 Mins Read

    Postfix SASL Authentication is one of the most popular methods for remote SMTP authentication. It’s a secure, reliable, and highly configurable way of sending and receiving emails. Essentially, the Postfix SASL Authentication consists of an authentication server and a client. The client is a mail program that sends the message, and the authentication server validates the credentials of the user. Once authentication is successful, the message is sent and authenticated at the receiving server.

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    The following step will configure the Postfix server to relay emails from a remote SMTP server with authentication.

    1. First of all, configure the custom relayhost parameter. This will configure postfix to relay emails via the remote SMTP servers.
      sudo postconf -e "relayhost = smtp.gmail.com:587" 
      

      You can also configure the Postfix server for d relaying emails based on the sender address.

    2. create an SMTP host and authentication mapping file:
      sudo nano /etc/postfix/smtp_sasl_password 
      

      Add your remote SMTP host and credentials one per line. See the below example:

      smtp.gmail.com           [email protected]:your_email_password
      

      Save the file and close it.

    3. Next use the postmap command to update the Postfix lookup table for the above-created configuration file.
      sudo postmap /etc/postfix/smtp_sasl_password  
      
    4. Update the Postfix main configuration file with the following commands:
      sudo postconf -e "smtp_sasl_auth_enable = yes"
      sudo postconf -e "smtp_sasl_password_maps = hash:/etc/postfix/smtp_sasl_password"
      sudo postconf -e "smtp_sasl_security_options ="
      
    5. Finally, restart the Postfix service
      sudo systemctl restart postfix
      
    6. All done. You can verify the changes by sending an email via the configured remote SMTP servers.

    Postfix SASL Authentication provides a secure way to transfer emails, and it’s easy to set up. It also allows you to customize the authentication process, so if you want to use things like two-factor authentication or IP whitelisting, you can. Overall, Postfix SASL Authentication is a great option for anyone who needs a secure and reliable way to transfer emails. It’s a must-have for anyone who takes security seriously!

    authentication Mail server Postfix sasl smtp
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