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Configure the firewall (proxy-based) to route all outbound messages to IMSS, so that:
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Outgoing SMTP messages can only go to Postfix first and then go to IMSS servers.
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Incoming SMTP messages only come from IMSS servers.
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Configure IMSS to allow internal SMTP gateways to relay, through Postfix, to any domain through IMSS.
TipFor more information, see the Configuring SMTP Routing section of
the IMSS Administrator's
Guide.
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