The Postfix main.cf configuration file specifies a subset of all the parameters that controls the operation of the Postfix mail system. The master.cf configuration file defines how a client program connects to a service, and what daemon program runs when a service is requested. Postfix has two main configuration files: master.cf and main.cf. Modify your Postfix settings to inject SPF checking to the Postfix message flow. Postfix then takes the appropriate action. A script will be used to do SPF checking and report specific actions to Postfix. This solution makes use of the Postfix SMTP access policy delegation mechanism. The complete specifications of SPF are documented in RFC For a simple introduction, visit This document guides you on how to integrate SPF checking for IMSVA 9.0. Organizations who want to adopt SPF are required to publish DNS records for the hosts that are used in MAIL FROM and HELO identities so that recipients can identify whether a host is authorized to send messages for the domain by querying these records. Introduction SPF (Sender Policy Framework) is an open standard which provides solutions to resist sender address forgery. 1 IMSVA 9.0 Sender Policy Framework Configuration Guide 1.
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