For this
The output from get outlook mail activity will be of type System.Collections.Generic.List(System.Net.Mail.MailMessage)
Then
When we pass the above variable to for each loop then we need to change the type argument property of for each activity as System.Net.Mail.MailMessage
And inside the loop to save the item.Body where item is the variable from for each activity
Then we need to create a simple String type of variable to store the mailbody content