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I am using Snow Leopard Server's mail service to relay mail through my ISP's mail relay over port 25. However, they requested that I start using port 587. How can I change the port used?

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When inserting the name of the host through which to relay outbound mail, add brackets around the name, then add a colon followed by the port number.

smtp.example.com becomes [smtp.example.com]:587

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