I have multiple mailboxes and I want to save space by moving some of them in an external storage. I'd like to still be able to view the email using
Mail.app even if said mailbox is now located in an external storage.
After reading upon it, I symlinked a mailbox
.mbox from the external storage to the original location
~/Library/Mail/Mailboxes/ however upon opening
Mail.app, the mailbox that was moved to the external storage is set as read-only and no email can be added to it as well as any email content within the mailbox not being read. The read-only seems to disappear when I directly drag and drop a mail from
Mail.app to the location of the
.mbox in the external storage.
The OS is
El Capitan and the external drive that I worked with is a 1TB HDD seagate drive.