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Postfix: The Definitive Guide by Kyle D. Dent

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Name

smtpd_noop_commands

Possible values:

explicit list

Default:

(null)

List of SMTP commands that Postfix should accept but take no action on. Postfix always replies to these noop commands with a status of "250 Ok."

Example:

smtpd_noop_commands = vrfy, expn

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