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The Postfix configuration file specifies a very small subset of all the parameters that control the operation of the Postfix mail system.

The "{}" is required for "value1", optional for "value2".

This form is supported with Postfix versions ≥ 3.0.

The remainder of this document is a description of all Postfix configuration parameters.

Default values are shown after the parameter name in parentheses, and can be looked up with the "postconf -d" command.

Note: this is not an invitation to make changes to Postfix configuration parameters.

Unnecessary changes are likely to impair the operation of the mail system.The numerical Postfix SMTP server response code for an access(5) map "defer" action, including "defer_if_permit" or "defer_if_reject".Prior to Postfix 2.6, the response is hard-coded as "450".Do not change this unless you have a complete understanding of RFC 5321.This feature is available in Postfix 2.6 and later.The amount of time between verify(8) address verification database cleanup runs.