Setting up the Postfix SMTP server to route all your email to an external SMTP Gateway

Suppose you want all your web servers to locally send all email (maybe from your contact forms, or whatever) to a real smtp gateway. If you're running postfix as your MTA, this is quite easy to achieve. In your main.cf file (usually /etc/postfix/main.cf or /usr/local/etc/postfix/main.cf), specify your transport maps: transport_maps...

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