caseful local part, so that +caseful can restore it, even if this router is
handling local parts caselessly. However, we can't just pass cc_local_part,
because that doesn't have the prefix or suffix stripped. A bit of massaging is
caseful local part, so that +caseful can restore it, even if this router is
handling local parts caselessly. However, we can't just pass cc_local_part,
because that doesn't have the prefix or suffix stripped. A bit of massaging is