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[Alan]

How to disable plain text authentication for POP3 and SMTP to achieve PCI compliance?

APPLIES TO:

Plesk 10.3 for Linux/Unix

Symptoms
Qmail MTA and Courier IMAP POP3/IMAP server use plain text authentification by default.
Resolution
To forbid authorization without encrypting it is necessary to execute following commands:
# /usr/local/psa/admin/bin/pci_compliance_resolver --enable qmail
# /usr/local/psa/admin/bin/pci_compliance_resolver --enable courier



http://kb.parallels.com/en/112039