If I'm not mistaken that's impossible due to the POP3 protocol
restrictions, the messages are removed using the DELE command, and
there's some command to get the numers of the messages and UUIDs.
If this assumption is right, the only possibilities would be to prevent
deletion using ACL (which would impact IMAP, too) or to insert a proxy
that prevents the DELE command from being executed.
Baltasar
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