How to Migrate Mail Ordner
How to migrate mail files/ordner from an old iMax OS X 9.x to a new iMax Yosemite
iMac
How to migrate mail files/ordner from an old iMax OS X 9.x to a new iMax Yosemite
iMac
For mail stored on the server, you just setup the setting on the new Mac.
Otherwise, drag and drop user -> your name -> Library -> Mail and Mail Downloads into their own folder on the new Mac after setting the server settings on the mail account.
Use Mail's Import Mailboxes function to import the mailboxes.
How to Migrate Mail Ordner