Eudora stores your messages in text files. There is one file for every mailbox.
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When you delete a message or move it to a different mailbox, the message itself is not immediately erased from the text file but only marked as deleted. This speeds up moving or deleting messages a lot.
When Eudora compacts a mailbox (either
- automatically or
- initiated by you as you select Special | Compact Mailboxes from the menu),
the messages marked as deleted are actually erased from the text file and the disk space such wasted is reclaimed.
