Hello,
it would be very nice to have a built-in email previewer that lets you see the rendering of the email on the various devices/resolutions.
Given that today there is a multitude of devices with different screen resolutions, it's very time-consuming having to test each email by actually sending it to the device, not to mention that not everybody has access to all the most popular models of smartphones and tablets, let alone ALL the possible resolutions existent today.
I would honestly expect for a solution such as Marketo to have this feature.
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