Interestingly, in re-reading notes about locallowercase... it seems only to suggest that this will be used for local delivery. So what about addresses of SENDERS?
Case insensitive mailbox names are allowed, but not required. Courier cannot assume that every other system in the world uses case insensitive mailbox names.
Therefore, locallowercase affects local mailbox names only. Mail addresses from remote systems are not affected, and are handled on an "as is" basis.
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