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How to prevent plaintext authentication via IMAP/POP3 and SMTP in Postfix on Plesk server?

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Marc Vidal
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Applicable to:

  • Plesk for Linux

Question

How to prevent cleartext / plaintext authentication via IMAP/POP3 and SMTP in Postfix on Plesk server?

Answer

Note: If you don't have root access to the Plesk server via SSH, contact your service provider regarding this issue.

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Plesk with Dovecot + Postfix

  1. Connect to the server via SSH

  2. Enable PCI compliance to Dovecot service:

    # plesk sbin pci_compliance_resolver --enable dovecot

  3. Enable PCI compliance to Postfix service:

    # plesk sbin pci_compliance_resolver --enable postfix

  4. Edit the file /etc/postfix/main.cf adding the following line:

    CONFIG_TEXT: smtpd_tls_auth_only=yes

  5. Restart mail services to apply the changes:

    # service postfix restart && service dovecot restart

 

Note: If Qmail is used, it is recommended to switch to Postfix. Forcing secure connection over SMTP in Qmail requires patching which is not supplied by Plesk.

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