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Execute the command "ppoossttmmaapp //eettcc//ppoossttffiixx//vviirrttuuaall" after editing the file.
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RRuunnnniinngg PPoossttffiixx bbeehhiinndd aa ffiirreewwaallll
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The simplest way to set up Postfix on a host behind a firewalled network is to
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send all mail to a gateway host, and to let that mail host take care of
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internal and external forwarding. Examples of that are shown in the local area
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network section above. A more sophisticated approach is to send only external
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Note: this example requires Postfix version 2.0 and later. To find out what
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Postfix version you have, execute the command "ppoossttccoonnff mmaaiill__vveerrssiioonn".