- Go to Settings
 - Open Email Accounts
 - Select your PrivateMail account
 - Open the Manage Folders tab
 - Under Manage Folders select the Import/Export Mail button
 

- In the popup window, select folder from the dropdown
 - If you press Export, all mails in selected folder will be placed into ZIP archive you can download
 - If you press Import, you can upload ZIP archive obtained with Export into the selected folder
 - You can also create such an archive manually; if you have mails saved as .EML files, place them into .ZIP archive and import it
 
