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Why would you want to know which client they are using? Email templates should be programmed to be client independant. But at least as far as I know this option is not available in Marketo.
That's too bad. For campaigns that are B2C facing, we've been considering embedded video and audio as well as animated GIFs in our email campaigns to make them more engaging. Some email clients support video, others support GIFs, and some only support static images. You can see a list here if you are interested of which email clients support which file formats: http://www.videoemail.com/supported-mail-clients/