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4xx/5xx greeting best practice? (not an smtp_skip_*_greeting question)

From: Darren (postfixbitfreak.org)
Date: Mon Jul 24 2006 - 20:21:12 CDT


Is it currently considered a safe and reasonable practice to run a
server configuration that will reject unauthorized clients with a 554
greeting? Basically, this kind of configuration:

smtpd_delay_reject = no
smtpd_client_restrictions =
        check_client_access hash:${config_directory}/allowed_clients,
        reject

In allowed_clients:
mx.example.com OK

RFC 2821 says I can do this, but it's not my own adherence to standards
I really have to worry about.