11.27.1 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.
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.