IMAP list with wrong delimiter could return [None], so trying with another delimiter in that case darcs-hash:20080725215323-86b55-f4b7cc15e8b30aaebf2fe5233ab40e4409ebf9a2.gz
IMAP list with wrong delimiter could return [None], so trying with another delimiter in that case darcs-hash:20080725215323-86b55-f4b7cc15e8b30aaebf2fe5233ab40e4409ebf9a2.gz