PCI compliance: Disable AUTH on Port 25

1146145 pts.
Tags:
Authentication
PCI compliance
PCI DSS
TLS
Due to PCI compliance, we have to disable plaintext authentication. We were able to do this through encapsulating communications between our mail server and clients with TLS on port 465. Here's where the problem is: Port 25 has to remain open / unencrypted for us to receive mail, but it shouldn't allow authentication. We're tried to disable the AUTH command but that didn't work. What should we do?
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