Importing the Selected Messages
If you’re using the 64-bit version of MailMate, there is a built-in bundle for importing from EagleFiler. First, go to the Bundles tab of MailMate’s preferences window and make sure that EagleFiler is checked. Then you can select messages in MailMate and choose Command ‣ EagleFiler ‣ Add to import them into EagleFiler.
Manually Importing Message Files
You can import individual messages from MailMate by dragging and dropping them.
To import a whole mailbox, find its folder in the folder:
/Users/<username>/Library/Application Support/MailMate/Messages/IMAP/
and drag it into EagleFiler. EagleFiler will import all the .eml files and skip the .emlh files.