__________[ RED LOCAL (LAN) ]________ _________[ INTERNET ]________
( ) ( )
( Mi PC Mi servidor de internet ) ( Servidor de Correo )
( con ISA Server ) ( MIXMAIL )
( ) ( mx01.mixmail.com )
( [_] <------------> [_] <-----------------------> [_] )
( / \ / \ ) ( / \ )
(_____|________________________________) (___________________|_________)
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+------------------[ Conexion via Modem ]---------------+