Head to ''Messaging'' in the main navigation bar at the top of your account and select ''Email Journeys'' from the drop down.
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If there are emails within the desired email journey that have been sent, the clipboard icon over on the right hand side of the page in the ''Actions'' column will become clickable.
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After clicking it, you will be shown your email stats.
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Over on top right hand side of the page, there is an ''export to csv'' button which will export the email stats in a report for you.