12.14.1 Mailbox Objects

All implementations of Mailbox objects have one externally visible method:

Return the next message in the mailbox, created with the optional factory argument passed into the mailbox object's constructor. By defaul this is an 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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