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        @param mind: usually None.  See the description of mind in
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            may be a list like (IMailAccount, IUserChooser, IServiceInfo).  To
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            that will be relayed to the user MUST be returned as an
            IMailAccount implementor; IMAP clients would not be able to
            understand anything else. Any information about unusual status
            would have to be relayed as a single mail message in an
            otherwise-empty mailbox. However, in a web-based mail system, or a
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            (implemented with a dynamic page-viewing mechanism such as a
            Twisted Web Resource) or on the user's client program may be
            intelligent enough to respond to several ``server''-side
            interfaces.

        @return: A deferred which will fire a tuple of (interface,
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