Postfix Mail Server Tutorials and Howtos
Postfix Mail Server
The Postfix mail server is an open-source mail transfer agent that is designed to route and deliver electronic mail. Created by Wietse Venema, Postfix was originally created as a fast, secure, easy-to-use, alternative to Sendmail. We are deeply involved with Postfix training, consulting, and general mail server projects. Don't hesitate to contact us with questions or comments.
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DKIM is more advanced and uses a public key to sign email so that the recipient can verify the sender. The recipient must be able to access the public key using DNS. Yahoo and Gmail both use this technology. This is an example on connecting Postfix to dkimproxy.out for signing outbound messages.
