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I've always wondered how Campaign Monitor automatically generates email previews for 20+ different email clients using a given template? Where would one even begin to automate such a process?

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3 Answers

Similar to Litmus, there's also http://PreviewMyEmail.com which provides white-label API

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Campaign Monitor uses a third party service at http://litmus.com/ which handles the actual testing for them.

They have an API which can be used to automate the testing for you.

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I believe that it is done using virtualization. VirtualBox is not difficult to script and automate. I am sure that most virtualization systems are likewise.

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