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Configure all internal SMTP gateways to send outgoing messages to Postfix and then to IMSS servers.
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If you are replacing your SMTP gateway with IMSS, configure your internal mail server to send outgoing messages through Postfix and then to IMSS servers.
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Configure Postfix and IMSS to route all outgoing messages (to domains other than local), to the firewall, or deliver the messages.
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Configure IMSS to allow internal SMTP gateways to relay to any domain using IMSS.
TipFor more information, see the Configuring SMTP Routing section of
the IMSS Administrator's
Guide.
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