Importing Whole Mailboxes (Postbox 5–7)
Before importing into EagleFiler, make sure that Postbox has completely downloaded all the messages and use the Compact Folders command. The POP/local mailboxes are stored in the folder:
~/Library/Application Support/Postbox/Profiles/<profile>/Mail/Local Folders/
(See How can I open the Library folder?.) The IMAP mailboxes are stored in the folder:
~/Library/Application Support/Postbox/Profiles/<profile>/ImapMail/
The mailbox files have no extension and can be dragged from the Finder to EagleFiler. The .msf files are not mailboxes and can be ignored or deleted from EagleFiler’s library.
Importing the Selected Messages (Postbox 6 and 7)
Select the messages in Postbox and choose File ‣ Save As ‣ File. Choose a folder in your EagleFiler library, e.g. the To Import folder. Postbox will save each message as a .eml file. For large numbers of messages, EagleFiler will be faster if you merge the .eml files into a single mailbox using the Merge Message Files command after importing.
Importing Individual Messages (Postbox 5)
You can drag and drop the selected messages from Postbox to EagleFiler. You can also use the File ‣ Save As ‣ File command to save a message in Mail Files format. Either way you will end up with one .eml file per message in EagleFiler.
For large numbers of messages, EagleFiler will be faster if you merge the .eml files into a single mailbox using the Merge Message Files command after importing.