plugin=attach is not implemented.
http://pocketstudio.jp/linux/?DRAC%252FPOP%2520IMAP%2520%25A5%25B5%25A1%25BC%25A5%25D0%25A4%25CE%25C4%25B4%25C0%25B0%2520%2528POP%2520IMAP%2520Server%2520Modifications%2529
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plugin=attach is not implemented.