readMessageFilenames in Mail::Box::Maildir does exclude some files. Look for the file whose name does not match the pattern /^([0-9][\w.:,=\-]+)$/. It also does some trickery with the numbers that the filenames are supposed to start with, so if you've got two files that are named something like like "0012345abc" and "012345abc", one of those is going to get ignored.

In reply to Re^3: Display filenames in mbox folder by Anonymous Monk
in thread Display filenames in mbox folder by peterr

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