Select some messages and press the capture key. EagleFiler will preserve the notes (as EagleFiler notes) and message status and label (as EagleFiler tags).
Please note that Mailsmith only reports to EagleFiler which messages are selected, not which mailboxes are. So if you select a mailbox and no messages, EagleFiler will report an error.
Note: If you want to separate messages by age before importing them into EagleFiler, you may find it helpful to use Email Archiver.