Start Evolution by pressing Applications → Internet → Evolution Mail.

Press File → Import... to start the Evolution Import Assistant. Then, press Forward.

Select Import a single file and then press Forward.

Press Browse..., locate the folder which you saved your emails into and open it.

Open the folder Local Folders and look for files with names such as Inbox. Select a file and press Open. If you have many email messages, you may have to wait a while for the file to be checked before you can continue.

In File type, Berkeley mailbox (mbox) should be selected. Press Forward.

Select the location you would like to copy the saved emails into by pressing the button labelled Destination folder. By default this will be the Inbox folder, which is the recommended destination for your emails. Then, press Forward.

Press Import to import your email messages. If you have a large number of emails, then the import process may take a while. Once importing has finished, your emails should be available for viewing immediately.