SMTP Relay Configuration for Postfix Based System

Follow these steps to configure your Postfix based system to use Nexiwave Email Relay service.

(This is prepared based on RedHat/CentOS based systems. Similar steps should work for other Linux flavours)


  • Your system is already configured Postfix.
  • You can already send voicemails as emails.


  1. Configure /etc/postfix/sasl_passwd:
    • Add your Nexiwave username and password to¬†/etc/postfix/sasl_passwd: username:password
      Note: you can obtain additional username/password for your Nexiwave account from "Additional Credentials" page (Login -> Settings -> Additional Credentials).
    • Create the hash db file for Postfix by running the postmap command:
      postmap /etc/postfix/sasl_passwd
  2. Configure /etc/postfix/
    • Update the relayhostparameter to
      # specify SMTP relay host
      relayhost =
    • At the end of the file, add the following parameters to enable authentication:
      # enable SASL authentication
      smtp_sasl_auth_enable = yes
      # disallow methods that allow anonymous authentication.
      smtp_sasl_security_options = noanonymous
      # where to find sasl_passwd
      smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
      # Enable STARTTLS encryption
      smtp_use_tls = yes
      # where to find CA certificates
      smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
  3. Restart Postfix:
    service postfix restart

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