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L1 Bithead

We have a rule on our PAN which allows tcp/25 app. SMTP to our MTA.

The MTA allows also TLS which establishes an encrypted connection on the same port.

Is therefore another PAN application necessary?




L4 Transporter

I would set the service to port 25, and then observe what applications are being used.

I imagine that it will be the smtp and ssl apps.

I set the service to port 25 and the only logged application is SMTP.

In the MTA Logs I see the encrypted connection: “Delivery connection successfully accepted TLS protocol”.

So maybe TLS is implemented in the SMTP application…

I would just lock the app down the smtp and the service to application-default.

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