From the Mail::Box documentation, diagnostics section:

Warning: Changes not written to read-only folder $self.

You have opened the folder read-only --which is the default set by new(access)--, made modifications, and now want to close it. Set close(force) if you want to overrule the access mode, or close the folder with close(write) set to NEVER.

-- Time flies when you don't know what you're doing

In reply to Re: Mail::Box-deleting messages by FloydATC
in thread Mail::Box-deleting messages by deadpickle

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