Please give a try,
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Read the mail messages using get outlook mail message and store it in the Variable lstMail, type - list(mailmessage)
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Loop the mail messages using for each activity,set type argument as system.net.mail.mailmessage and pass value as lstMail.
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Inside for each activity use save mail message activity and save the mail in .eml format.
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After saving use start process activity and pass the file path of the previously saved file.(it will open the mail)
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Take the screenshot using take screenshot activity and save image activity.
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Use close application or close window activity to close the opened mail.
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Delete the mail file we saved previously using delete activity.
Thanks