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Robert Dyas has over 250,000 email subscribers. About 50% view their emails on mobile devices, on dozens of different email clients. It is important for all my emails to be tested across multiple devices and email clients.
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'New In' campaign email viewed on desktop.
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I use gif animations to add extra emphasis to a product or saving. Optimisation becomes more important with these to keep load times in check.
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The same 'New In' email viewed on smartphone.