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Signature blocking telnet to SMTP server

Is it possible to block telnet to SMTP server from port 25 with IDS. I want to create a custom signature for this but I don't know how. If I write as hello it will block all.

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Anonymous
N/A

Re: Signature blocking telnet to SMTP server

You mean you want to prevent people from interactively telnetting to port 25, but still allow regular SMTP mail through?

Sorry, that's impossible. There is _NO_ difference on the wire between those two operations, so there's nothing you can select on to permit or deny.

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