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Emails sent from Plesk server to gmail account show "not encrypted" message

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George Alibegashvili
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Emails sent to an external account such as Gmail, shows the following message:

    CONFIG_TEXT: security: example.com did not encrypt this message

  • Mail is not delivering with the following message in /var/log/mailllog:

    CONFIG_TEXT: status=deferred (delivery temporarily suspended: TLS is required, but was not offered by host 127.0.0.1[127.0.0.1])

Cause

Incorrect Postfix configuration.

  • Parameter smtp_tls_security_level = may is missing in the /etc/postfix/main.cf:

    # grep smtp_tls_security_level /etc/postfix/main.cf

Resolution

  1. Connect to the server via SSH

  2. Edit file /etc/postfix/main.cf with correct parameter:

    # grep smtp_tls_security_level /etc/postfix/main.cf
    smtp_tls_security_level = may

  3. Restart postfix services:

    # service postfix restart

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