12.14.1 Mailbox Objects

All implementations of Mailbox objects have one externally visible method:

next ()
Return the next message in the mailbox, as a rfc822.Message object (see the rfc822 module). Depending on the mailbox implementation the fp attribute of this object may be a true file object or a class instance simulating a file object, taking care of things like message boundaries if multiple mail messages are contained in a single file, etc. If no more messages are available, this method returns None.

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