My Experience of Setting Up DKIM and SPF with Postfix and Ubuntu For Sending Email

I am developing a web application which needs to send email. The application is running on Ubuntu 12.04 64-bit and is using Postfix as the MTA, and therefore the web application is using Postfix to send outgoing emails.

To raise the chance of successful delivery of mail to the recipients, it is advised to setup DKIM and SPF for my environment.

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