Determine Email Client
Does Marketo allow you to run a report on your database's email client market share, similar to these Litmus analytics?
Does Marketo allow you to run a report on your database's email client market share, similar to these Litmus analytics?
Unfortunately, the simple answer is no. There is some client specific data collected on the lead level, within the email open activity, but it's difficult to decipher and can't be accessed in aggregate.

The new email insights tool does a pretty good job of breaking down email performance by device type and OS, but it doesn't allow you to drill down into the specific email client. You can also access device type and OS data through smart lists, by constraining the email open filter.
I hope that helps!
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